diff --git a/cmd/protoc-gen-go-tableau-loader/code.go b/cmd/protoc-gen-go-tableau-loader/code.go
deleted file mode 100644
index acfefeac..00000000
--- a/cmd/protoc-gen-go-tableau-loader/code.go
+++ /dev/null
@@ -1,29 +0,0 @@
-package main
-
-import (
-	"path/filepath"
-
-	"google.golang.org/protobuf/compiler/protogen"
-)
-
-const codePkg = "code"
-
-// generateCode generates related code files.
-func generateCode(gen *protogen.Plugin) {
-	filename := filepath.Join(codePkg, "code."+pcExt+".go")
-	g := gen.NewGeneratedFile(filename, "")
-	generateCommonHeader(gen, g)
-	g.P()
-	g.P("package ", codePkg)
-	g.P()
-	g.P(staticCodeContent)
-	g.P()
-}
-
-const staticCodeContent = `type Code int
-
-const (
-	Success Code = iota
-	NotFound
-	Unknown
-)`
diff --git a/cmd/protoc-gen-go-tableau-loader/error.go b/cmd/protoc-gen-go-tableau-loader/error.go
deleted file mode 100644
index 383e116e..00000000
--- a/cmd/protoc-gen-go-tableau-loader/error.go
+++ /dev/null
@@ -1,69 +0,0 @@
-package main
-
-import (
-	"path/filepath"
-
-	"google.golang.org/protobuf/compiler/protogen"
-)
-
-const errPkg = "xerrors"
-
-// generateError generates related error files.
-func generateError(gen *protogen.Plugin) {
-	filename := filepath.Join(errPkg, "xerrors."+pcExt+".go")
-	g := gen.NewGeneratedFile(filename, "")
-	generateCommonHeader(gen, g)
-	g.P()
-	g.P("package ", errPkg)
-	g.P()
-	g.P(`import (`)
-	g.P(`"errors"`)
-	g.P(`"fmt"`)
-	g.P(codePackage)
-	g.P(")")
-	g.P(staticErrorContent)
-	g.P()
-}
-
-const staticErrorContent = `
-
-type Error struct {
-	code  code.Code
-	cause error
-}
-
-func (e *Error) Code() code.Code {
-	if e == nil {
-		return code.Success
-	}
-	return e.code
-}
-
-func (e *Error) Error() string {
-	if e == nil {
-		return "<nil>"
-	}
-	return fmt.Sprintf("code: %d, cause: %+v", e.code, e.cause)
-}
-
-func Errorf(code code.Code, format string, args ...interface{}) error {
-	return &Error{
-		code:  code,
-		cause: fmt.Errorf(format, args...),
-	}
-}
-
-func Code(err error) code.Code {
-	if err == nil {
-		return code.Success
-	}
-	var e *Error
-	if errors.As(err, &e) {
-		return e.Code()
-	}
-	return code.Unknown
-}
-
-func Is(err error, code code.Code) bool {
-	return Code(err) == code
-}`
diff --git a/cmd/protoc-gen-go-tableau-loader/errors.go b/cmd/protoc-gen-go-tableau-loader/errors.go
new file mode 100644
index 00000000..52554f8d
--- /dev/null
+++ b/cmd/protoc-gen-go-tableau-loader/errors.go
@@ -0,0 +1,26 @@
+package main
+
+import (
+	"path/filepath"
+
+	"google.golang.org/protobuf/compiler/protogen"
+)
+
+// generateError generates related error files.
+func generateError(gen *protogen.Plugin) {
+	filename := filepath.Join("errors." + pcExt + ".go")
+	g := gen.NewGeneratedFile(filename, "")
+	generateCommonHeader(gen, g)
+	g.P()
+	g.P("package ", *pkg)
+	g.P()
+	g.P(staticErrorContent)
+	g.P()
+}
+
+const staticErrorContent = `
+import (
+	"errors"
+)
+
+var ErrNotFound = errors.New("not found")`
diff --git a/cmd/protoc-gen-go-tableau-loader/main.go b/cmd/protoc-gen-go-tableau-loader/main.go
index 1c65f716..642de7f8 100644
--- a/cmd/protoc-gen-go-tableau-loader/main.go
+++ b/cmd/protoc-gen-go-tableau-loader/main.go
@@ -37,7 +37,6 @@ func main() {
 		}
 		generateHub(gen)
 		generateError(gen)
-		generateCode(gen)
 		return nil
 	})
 }
diff --git a/cmd/protoc-gen-go-tableau-loader/messager.go b/cmd/protoc-gen-go-tableau-loader/messager.go
index ce18b262..5fd0f391 100644
--- a/cmd/protoc-gen-go-tableau-loader/messager.go
+++ b/cmd/protoc-gen-go-tableau-loader/messager.go
@@ -23,20 +23,16 @@ const (
 	pairPackage    = protogen.GoImportPath("github.com/tableauio/loader/pkg/pair")
 	timePackage    = protogen.GoImportPath("time")
 	sortPackage    = protogen.GoImportPath("sort")
+	fmtPackage     = protogen.GoImportPath("fmt")
 	protoPackage   = protogen.GoImportPath("google.golang.org/protobuf/proto")
 )
 
 // golbal container for record all proto filenames and messager names
 var messagers []string
-var errorsPackage protogen.GoImportPath
-var codePackage protogen.GoImportPath
 
 // generateMessager generates a protoconf file corresponding to the protobuf file.
 // Each wrapped struct type implement the Messager interface.
 func generateMessager(gen *protogen.Plugin, file *protogen.File) {
-	errorsPackage = protogen.GoImportPath(string(file.GoImportPath) + "/" + *pkg + "/" + errPkg)
-	codePackage = protogen.GoImportPath(string(file.GoImportPath) + "/" + *pkg + "/" + codePkg)
-
 	filename := filepath.Join(file.GeneratedFilenamePrefix + "." + pcExt + ".go")
 	g := gen.NewGeneratedFile(filename, "")
 	generateFileHeader(gen, file, g)
@@ -224,7 +220,7 @@ func genMapGetters(gen *protogen.Plugin, g *protogen.GeneratedFile, message *pro
 			g.P("d := ", container, ".Get", field.GoName, "()")
 			lastKeyName := keys[len(keys)-1].Name
 			g.P("if val, ok := d[", lastKeyName, "]; !ok {")
-			g.P(`return `, returnEmptyValue, `, `, errorsPackage.Ident("Errorf"), `(`, codePackage.Ident("NotFound"), `, "`, lastKeyName, `(%v) not found", `, lastKeyName, `)`)
+			g.P(`return `, returnEmptyValue, `, `, fmtPackage.Ident("Errorf"), `("`, lastKeyName, `(%v) %w", `, lastKeyName, `, ErrNotFound)`)
 			g.P("} else {")
 			g.P(`return val, nil`)
 			g.P("}")
diff --git a/cmd/protoc-gen-go-tableau-loader/ordered_map.go b/cmd/protoc-gen-go-tableau-loader/ordered_map.go
index 2c5d7cbe..707616ce 100644
--- a/cmd/protoc-gen-go-tableau-loader/ordered_map.go
+++ b/cmd/protoc-gen-go-tableau-loader/ordered_map.go
@@ -179,7 +179,7 @@ func genOrderedMapGetters(gen *protogen.Plugin, g *protogen.GeneratedFile, md pr
 					keyName = fmt.Sprintf("BoolToInt(%s)", keyName)
 				}
 				g.P("if val, ok := conf.Get(", keyName, "); !ok {")
-				g.P(`return nil, `, errorsPackage.Ident("Errorf"), `(`, codePackage.Ident("NotFound"), `, "`, lastKeyName, `(%v) not found", `, lastKeyName, `)`)
+				g.P(`return nil, `, fmtPackage.Ident("Errorf"), `("`, lastKeyName, `(%v) %w", `, lastKeyName, `, ErrNotFound)`)
 				g.P("} else {")
 				g.P(`return val.First, nil`)
 				g.P("}")
diff --git a/test/go-tableau-loader/main.go b/test/go-tableau-loader/main.go
index 52820135..329c6838 100644
--- a/test/go-tableau-loader/main.go
+++ b/test/go-tableau-loader/main.go
@@ -1,12 +1,12 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"time"
 
 	"github.com/tableauio/loader/test/go-tableau-loader/hub"
-	"github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/code"
-	"github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/xerrors"
+	"github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader"
 	"github.com/tableauio/tableau/format"
 	"github.com/tableauio/tableau/load"
 	"github.com/tableauio/tableau/store"
@@ -33,7 +33,7 @@ func main() {
 
 	// error: not found
 	if _, err := conf.Get3(100001, 1, 999); err != nil {
-		if xerrors.Is(err, code.NotFound) {
+		if errors.Is(err, loader.ErrNotFound) {
 			fmt.Println("error: not found:", err)
 		}
 	}
diff --git a/test/go-tableau-loader/protoconf/loader/code/code.pc.go b/test/go-tableau-loader/protoconf/loader/errors.pc.go
similarity index 68%
rename from test/go-tableau-loader/protoconf/loader/code/code.pc.go
rename to test/go-tableau-loader/protoconf/loader/errors.pc.go
index b85d52fe..3d7d5848 100644
--- a/test/go-tableau-loader/protoconf/loader/code/code.pc.go
+++ b/test/go-tableau-loader/protoconf/loader/errors.pc.go
@@ -3,12 +3,10 @@
 // - protoc-gen-go-tableau-loader v0.8.0
 // - protoc                       v3.19.3
 
-package code
+package loader
 
-type Code int
-
-const (
-	Success Code = iota
-	NotFound
-	Unknown
+import (
+	"errors"
 )
+
+var ErrNotFound = errors.New("not found")
diff --git a/test/go-tableau-loader/protoconf/loader/hero_conf.pc.go b/test/go-tableau-loader/protoconf/loader/hero_conf.pc.go
index 81f4291e..b9b00332 100644
--- a/test/go-tableau-loader/protoconf/loader/hero_conf.pc.go
+++ b/test/go-tableau-loader/protoconf/loader/hero_conf.pc.go
@@ -7,12 +7,11 @@
 package loader
 
 import (
+	fmt "fmt"
 	pair "github.com/tableauio/loader/pkg/pair"
 	treemap "github.com/tableauio/loader/pkg/treemap"
 	protoconf "github.com/tableauio/loader/test/go-tableau-loader/protoconf"
 	base "github.com/tableauio/loader/test/go-tableau-loader/protoconf/base"
-	code "github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/code"
-	xerrors "github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/xerrors"
 	format "github.com/tableauio/tableau/format"
 	load "github.com/tableauio/tableau/load"
 	store "github.com/tableauio/tableau/store"
@@ -115,7 +114,7 @@ func (x *HeroConf) processAfterLoad() error {
 func (x *HeroConf) Get1(name string) (*protoconf.HeroConf_Hero, error) {
 	d := x.Data().GetHeroMap()
 	if val, ok := d[name]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "name(%v) not found", name)
+		return nil, fmt.Errorf("name(%v) %w", name, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -130,7 +129,7 @@ func (x *HeroConf) Get2(name string, title string) (*protoconf.HeroConf_Hero_Att
 	}
 	d := conf.GetAttrMap()
 	if val, ok := d[title]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "title(%v) not found", title)
+		return nil, fmt.Errorf("title(%v) %w", title, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -259,7 +258,7 @@ func (x *HeroBaseConf) processAfterLoad() error {
 func (x *HeroBaseConf) Get1(name string) (*base.Hero, error) {
 	d := x.Data().GetHeroMap()
 	if val, ok := d[name]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "name(%v) not found", name)
+		return nil, fmt.Errorf("name(%v) %w", name, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -274,7 +273,7 @@ func (x *HeroBaseConf) Get2(name string, id string) (*base.Item, error) {
 	}
 	d := conf.GetItemMap()
 	if val, ok := d[id]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "id(%v) not found", id)
+		return nil, fmt.Errorf("id(%v) %w", id, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -290,7 +289,7 @@ func (x *HeroBaseConf) GetOrderedMap() *ProtoconfHeroBaseConfHeroMap_OrderedMap
 func (x *HeroBaseConf) GetOrderedMap1(name string) (*BaseHeroItemMap_OrderedMap, error) {
 	conf := x.orderedMap
 	if val, ok := conf.Get(name); !ok {
-		return nil, xerrors.Errorf(code.NotFound, "name(%v) not found", name)
+		return nil, fmt.Errorf("name(%v) %w", name, ErrNotFound)
 	} else {
 		return val.First, nil
 	}
diff --git a/test/go-tableau-loader/protoconf/loader/item_conf.pc.go b/test/go-tableau-loader/protoconf/loader/item_conf.pc.go
index 432f2d9b..c8169c91 100644
--- a/test/go-tableau-loader/protoconf/loader/item_conf.pc.go
+++ b/test/go-tableau-loader/protoconf/loader/item_conf.pc.go
@@ -7,10 +7,9 @@
 package loader
 
 import (
+	fmt "fmt"
 	treemap "github.com/tableauio/loader/pkg/treemap"
 	protoconf "github.com/tableauio/loader/test/go-tableau-loader/protoconf"
-	code "github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/code"
-	xerrors "github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/xerrors"
 	format "github.com/tableauio/tableau/format"
 	load "github.com/tableauio/tableau/load"
 	store "github.com/tableauio/tableau/store"
@@ -247,7 +246,7 @@ func (x *ItemConf) processAfterLoad() error {
 func (x *ItemConf) Get1(id uint32) (*protoconf.ItemConf_Item, error) {
 	d := x.Data().GetItemMap()
 	if val, ok := d[id]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "id(%v) not found", id)
+		return nil, fmt.Errorf("id(%v) %w", id, ErrNotFound)
 	} else {
 		return val, nil
 	}
diff --git a/test/go-tableau-loader/protoconf/loader/patch_conf.pc.go b/test/go-tableau-loader/protoconf/loader/patch_conf.pc.go
index 51f4c4fa..fe045329 100644
--- a/test/go-tableau-loader/protoconf/loader/patch_conf.pc.go
+++ b/test/go-tableau-loader/protoconf/loader/patch_conf.pc.go
@@ -7,9 +7,8 @@
 package loader
 
 import (
+	fmt "fmt"
 	protoconf "github.com/tableauio/loader/test/go-tableau-loader/protoconf"
-	code "github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/code"
-	xerrors "github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/xerrors"
 	format "github.com/tableauio/tableau/format"
 	load "github.com/tableauio/tableau/load"
 	store "github.com/tableauio/tableau/store"
@@ -160,7 +159,7 @@ func (x *PatchMergeConf) originalMessage() proto.Message {
 func (x *PatchMergeConf) Get1(id uint32) (*protoconf.Item, error) {
 	d := x.Data().GetItemMap()
 	if val, ok := d[id]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "id(%v) not found", id)
+		return nil, fmt.Errorf("id(%v) %w", id, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -240,7 +239,7 @@ func (x *RecursivePatchConf) originalMessage() proto.Message {
 func (x *RecursivePatchConf) Get1(shopId uint32) (*protoconf.RecursivePatchConf_Shop, error) {
 	d := x.Data().GetShopMap()
 	if val, ok := d[shopId]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "shopId(%v) not found", shopId)
+		return nil, fmt.Errorf("shopId(%v) %w", shopId, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -255,7 +254,7 @@ func (x *RecursivePatchConf) Get2(shopId uint32, goodsId uint32) (*protoconf.Rec
 	}
 	d := conf.GetGoodsMap()
 	if val, ok := d[goodsId]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "goodsId(%v) not found", goodsId)
+		return nil, fmt.Errorf("goodsId(%v) %w", goodsId, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -270,7 +269,7 @@ func (x *RecursivePatchConf) Get3(shopId uint32, goodsId uint32, type_ uint32) (
 	}
 	d := conf.GetCurrencyMap()
 	if val, ok := d[type_]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "type_(%v) not found", type_)
+		return nil, fmt.Errorf("type_(%v) %w", type_, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -285,7 +284,7 @@ func (x *RecursivePatchConf) Get4(shopId uint32, goodsId uint32, type_ uint32, k
 	}
 	d := conf.GetValueList()
 	if val, ok := d[key4]; !ok {
-		return 0, xerrors.Errorf(code.NotFound, "key4(%v) not found", key4)
+		return 0, fmt.Errorf("key4(%v) %w", key4, ErrNotFound)
 	} else {
 		return val, nil
 	}
diff --git a/test/go-tableau-loader/protoconf/loader/test_conf.pc.go b/test/go-tableau-loader/protoconf/loader/test_conf.pc.go
index fbebbc1c..96cec9d8 100644
--- a/test/go-tableau-loader/protoconf/loader/test_conf.pc.go
+++ b/test/go-tableau-loader/protoconf/loader/test_conf.pc.go
@@ -7,11 +7,10 @@
 package loader
 
 import (
+	fmt "fmt"
 	pair "github.com/tableauio/loader/pkg/pair"
 	treemap "github.com/tableauio/loader/pkg/treemap"
 	protoconf "github.com/tableauio/loader/test/go-tableau-loader/protoconf"
-	code "github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/code"
-	xerrors "github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/xerrors"
 	format "github.com/tableauio/tableau/format"
 	load "github.com/tableauio/tableau/load"
 	store "github.com/tableauio/tableau/store"
@@ -198,7 +197,7 @@ func (x *ActivityConf) processAfterLoad() error {
 func (x *ActivityConf) Get1(activityId uint64) (*protoconf.ActivityConf_Activity, error) {
 	d := x.Data().GetActivityMap()
 	if val, ok := d[activityId]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "activityId(%v) not found", activityId)
+		return nil, fmt.Errorf("activityId(%v) %w", activityId, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -213,7 +212,7 @@ func (x *ActivityConf) Get2(activityId uint64, chapterId uint32) (*protoconf.Act
 	}
 	d := conf.GetChapterMap()
 	if val, ok := d[chapterId]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "chapterId(%v) not found", chapterId)
+		return nil, fmt.Errorf("chapterId(%v) %w", chapterId, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -228,7 +227,7 @@ func (x *ActivityConf) Get3(activityId uint64, chapterId uint32, sectionId uint3
 	}
 	d := conf.GetSectionMap()
 	if val, ok := d[sectionId]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "sectionId(%v) not found", sectionId)
+		return nil, fmt.Errorf("sectionId(%v) %w", sectionId, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -243,7 +242,7 @@ func (x *ActivityConf) Get4(activityId uint64, chapterId uint32, sectionId uint3
 	}
 	d := conf.GetSectionRankMap()
 	if val, ok := d[key4]; !ok {
-		return 0, xerrors.Errorf(code.NotFound, "key4(%v) not found", key4)
+		return 0, fmt.Errorf("key4(%v) %w", key4, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -259,7 +258,7 @@ func (x *ActivityConf) GetOrderedMap() *ProtoconfActivityConfActivityMap_Ordered
 func (x *ActivityConf) GetOrderedMap1(activityId uint64) (*ProtoconfActivityConfActivityChapterMap_OrderedMap, error) {
 	conf := x.orderedMap
 	if val, ok := conf.Get(activityId); !ok {
-		return nil, xerrors.Errorf(code.NotFound, "activityId(%v) not found", activityId)
+		return nil, fmt.Errorf("activityId(%v) %w", activityId, ErrNotFound)
 	} else {
 		return val.First, nil
 	}
@@ -273,7 +272,7 @@ func (x *ActivityConf) GetOrderedMap2(activityId uint64, chapterId uint32) (*Pro
 		return nil, err
 	}
 	if val, ok := conf.Get(chapterId); !ok {
-		return nil, xerrors.Errorf(code.NotFound, "chapterId(%v) not found", chapterId)
+		return nil, fmt.Errorf("chapterId(%v) %w", chapterId, ErrNotFound)
 	} else {
 		return val.First, nil
 	}
@@ -287,7 +286,7 @@ func (x *ActivityConf) GetOrderedMap3(activityId uint64, chapterId uint32, secti
 		return nil, err
 	}
 	if val, ok := conf.Get(sectionId); !ok {
-		return nil, xerrors.Errorf(code.NotFound, "sectionId(%v) not found", sectionId)
+		return nil, fmt.Errorf("sectionId(%v) %w", sectionId, ErrNotFound)
 	} else {
 		return val.First, nil
 	}
@@ -459,7 +458,7 @@ func (x *ChapterConf) originalMessage() proto.Message {
 func (x *ChapterConf) Get1(id uint64) (*protoconf.ChapterConf_Chapter, error) {
 	d := x.Data().GetChapterMap()
 	if val, ok := d[id]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "id(%v) not found", id)
+		return nil, fmt.Errorf("id(%v) %w", id, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -539,7 +538,7 @@ func (x *ThemeConf) originalMessage() proto.Message {
 func (x *ThemeConf) Get1(name string) (*protoconf.ThemeConf_Theme, error) {
 	d := x.Data().GetThemeMap()
 	if val, ok := d[name]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "name(%v) not found", name)
+		return nil, fmt.Errorf("name(%v) %w", name, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -554,7 +553,7 @@ func (x *ThemeConf) Get2(name string, param string) (string, error) {
 	}
 	d := conf.GetParamMap()
 	if val, ok := d[param]; !ok {
-		return "", xerrors.Errorf(code.NotFound, "param(%v) not found", param)
+		return "", fmt.Errorf("param(%v) %w", param, ErrNotFound)
 	} else {
 		return val, nil
 	}
@@ -662,7 +661,7 @@ func (x *TaskConf) processAfterLoad() error {
 func (x *TaskConf) Get1(id int64) (*protoconf.TaskConf_Task, error) {
 	d := x.Data().GetTaskMap()
 	if val, ok := d[id]; !ok {
-		return nil, xerrors.Errorf(code.NotFound, "id(%v) not found", id)
+		return nil, fmt.Errorf("id(%v) %w", id, ErrNotFound)
 	} else {
 		return val, nil
 	}
diff --git a/test/go-tableau-loader/protoconf/loader/xerrors/xerrors.pc.go b/test/go-tableau-loader/protoconf/loader/xerrors/xerrors.pc.go
deleted file mode 100644
index 22daecbb..00000000
--- a/test/go-tableau-loader/protoconf/loader/xerrors/xerrors.pc.go
+++ /dev/null
@@ -1,53 +0,0 @@
-// Code generated by protoc-gen-go-tableau-loader. DO NOT EDIT.
-// versions:
-// - protoc-gen-go-tableau-loader v0.8.0
-// - protoc                       v3.19.3
-
-package xerrors
-
-import (
-	"errors"
-	"fmt"
-	"github.com/tableauio/loader/test/go-tableau-loader/protoconf/loader/code"
-)
-
-type Error struct {
-	code  code.Code
-	cause error
-}
-
-func (e *Error) Code() code.Code {
-	if e == nil {
-		return code.Success
-	}
-	return e.code
-}
-
-func (e *Error) Error() string {
-	if e == nil {
-		return "<nil>"
-	}
-	return fmt.Sprintf("code: %d, cause: %+v", e.code, e.cause)
-}
-
-func Errorf(code code.Code, format string, args ...interface{}) error {
-	return &Error{
-		code:  code,
-		cause: fmt.Errorf(format, args...),
-	}
-}
-
-func Code(err error) code.Code {
-	if err == nil {
-		return code.Success
-	}
-	var e *Error
-	if errors.As(err, &e) {
-		return e.Code()
-	}
-	return code.Unknown
-}
-
-func Is(err error, code code.Code) bool {
-	return Code(err) == code
-}