diff --git a/node_modules/.pnpm-workspace-state.json b/node_modules/.pnpm-workspace-state.json
new file mode 100644
index 0000000..f416e62
--- /dev/null
+++ b/node_modules/.pnpm-workspace-state.json
@@ -0,0 +1,25 @@
+{
+  "lastValidatedTimestamp": 1750960559706,
+  "projects": {},
+  "pnpmfileExists": false,
+  "settings": {
+    "autoInstallPeers": true,
+    "dedupeDirectDeps": false,
+    "dedupeInjectedDeps": true,
+    "dedupePeerDependents": true,
+    "dev": true,
+    "excludeLinksFromLockfile": false,
+    "hoistPattern": [
+      "*"
+    ],
+    "hoistWorkspacePackages": true,
+    "injectWorkspacePackages": false,
+    "linkWorkspacePackages": false,
+    "nodeLinker": "isolated",
+    "optional": true,
+    "preferWorkspacePackages": false,
+    "production": true,
+    "publicHoistPattern": []
+  },
+  "filteredInstall": false
+}
diff --git a/node_modules/.pnpm/lock.yaml b/node_modules/.pnpm/lock.yaml
new file mode 100644
index 0000000..c65e7f9
--- /dev/null
+++ b/node_modules/.pnpm/lock.yaml
@@ -0,0 +1,16 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+overrides:
+  pricing4ts: link:../../../../../Library/pnpm/global/5/node_modules/pricing4ts
+
+importers:
+
+  .:
+    dependencies:
+      pricing4ts:
+        specifier: link:../../../../../Library/pnpm/global/5/node_modules/pricing4ts
+        version: link:../../../../../Library/pnpm/global/5/node_modules/pricing4ts
diff --git a/node_modules/pricing4ts b/node_modules/pricing4ts
new file mode 120000
index 0000000..c9df06c
--- /dev/null
+++ b/node_modules/pricing4ts
@@ -0,0 +1 @@
+../../../../../../Library/pnpm/global/5/node_modules/pricing4ts
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index 36326ac..74138a7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
 
 	<groupId>io.github.isa-group</groupId>
 	<artifactId>Pricing4Java</artifactId>
-	<version>5.5.1</version>
+	<version>5.5.2</version>
 
 	<name>${project.groupId}:${project.artifactId}</name>
 	<description>A pricing driven feature toggling library for java</description>
diff --git a/src/main/java/io/github/isagroup/services/parsing/AddOnParser.java b/src/main/java/io/github/isagroup/services/parsing/AddOnParser.java
index e914312..b299e1c 100644
--- a/src/main/java/io/github/isagroup/services/parsing/AddOnParser.java
+++ b/src/main/java/io/github/isagroup/services/parsing/AddOnParser.java
@@ -179,7 +179,13 @@ private static void setAddOnFeatures(String addOnName, Map<String, Object> addOn
 
         for (String addOnFeatureName : addOnFeaturesMap.keySet()) {
 
-            Map<String, Object> addOnFeatureMap = (Map<String, Object>) addOnFeaturesMap.get(addOnFeatureName);
+            Object featureObj = addOnFeaturesMap.get(addOnFeatureName);
+            if (!(featureObj instanceof Map)) {
+                throw new PricingParsingException("The feature " + addOnFeatureName
+                        + " of the add-on " + addOnName + " is not a valid map. Maybe 'value' attribute is missing to set the value of the feature");
+            }
+            @SuppressWarnings("unchecked")
+            Map<String, Object> addOnFeatureMap = (Map<String, Object>) featureObj;
 
             if (!globalFeaturesMap.containsKey(addOnFeatureName)) {
                 throw new FeatureNotFoundException(
@@ -233,9 +239,23 @@ private static void setAddOnUsageLimits(String addOnName, Map<String, Object> ad
         Map<String, Object> addOnUsageLimitsMap = null;
 
         if (areExtensions) {
-            addOnUsageLimitsMap = (Map<String, Object>) addOnMap.get("usageLimitsExtensions");
+            Object usageLimitsExtensionsObj = addOnMap.get("usageLimitsExtensions");
+            if (usageLimitsExtensionsObj instanceof Map<?, ?>) {
+                addOnUsageLimitsMap = (Map<String, Object>) usageLimitsExtensionsObj;
+            } else if (usageLimitsExtensionsObj != null) {
+                throw new PricingParsingException("The field \"usageLimitsExtensions\" should be a map. It is currently: "
+                        + usageLimitsExtensionsObj.getClass().getSimpleName() + ". "
+                        + "Maybe you forgot to add the 'value' attribute to the usage limit in the add-on definition.");
+            }
         } else {
-            addOnUsageLimitsMap = (Map<String, Object>) addOnMap.get("usageLimits");
+            Object usageLimitsObj = addOnMap.get("usageLimits");
+            if (usageLimitsObj instanceof Map<?, ?>) {
+                addOnUsageLimitsMap = (Map<String, Object>) usageLimitsObj;
+            } else if (usageLimitsObj != null) {
+                throw new PricingParsingException("The field \"usageLimits\" should be a map. It is currently: "
+                        + usageLimitsObj.getClass().getSimpleName() + ". "
+                        + "Maybe you forgot to add the 'value' attribute to the usage limit in the add-on definition.");
+            }
         }
         Map<String, UsageLimit> globalUsageLimitsMap = pricingManager.getUsageLimits();
         Map<String, UsageLimit> addOnUsageLimits = new LinkedHashMap<>();
diff --git a/src/main/java/io/github/isagroup/services/parsing/FeatureParser.java b/src/main/java/io/github/isagroup/services/parsing/FeatureParser.java
index a6b8b4d..c58ad80 100644
--- a/src/main/java/io/github/isagroup/services/parsing/FeatureParser.java
+++ b/src/main/java/io/github/isagroup/services/parsing/FeatureParser.java
@@ -105,7 +105,17 @@ private static Integration parseMapToIntegration(String featureName, Map<String,
         }
 
         if (integration.getIntegrationType().equals(IntegrationType.WEB_SAAS)) {
-            integration.setPricingUrls((List<String>) map.get("pricingUrls"));
+            if (map.get("pricingUrls") != null) {
+                if (!(map.get("pricingUrls") instanceof List) || ((List<String>) map.get("pricingUrls")).isEmpty()
+                        || ((List<String>) map.get("pricingUrls")).stream().anyMatch(url -> !url.matches("^(http|https)://.*"))) {
+                    throw new PricingParsingException("The feature " + featureName
+                            + " is from type INTEGRATION with integrationType WEB_SAAS but does not have a valid pricingUrls list (each item must be a valid URL with the http or https protocol). Current value: " + map.get("pricingUrls")
+                            + ". To specify a list you must use dash (-) before each item. Remember, it is an optional field so you can remove it from the input.");
+                }
+                integration.setPricingUrls((List<String>) map.get("pricingUrls"));
+            } else {
+                integration.setPricingUrls(List.of());
+            }
         }
 
         return integration;
@@ -134,7 +144,7 @@ private static Automation parseMapToAutomation(String featureName, Map<String, O
 
         try {
             automation.setAutomationType(AutomationType.valueOf(automationType));
-        } catch (IllegalArgumentException e) {
+        } catch (NullPointerException | IllegalArgumentException e) {
             throw new InvalidAutomationTypeException(
                     "The feature " + featureName + " does not have a supported automationType (" + Arrays.toString(AutomationType.values()) + "). Current value: "
                             + automationType);
@@ -160,7 +170,11 @@ private static Guarantee parseMapToGuarantee(String featureName, Map<String, Obj
 
         if (map.get("docUrl") != null && !(map.get("docUrl") instanceof String)) {
             throw new PricingParsingException("\'docUrl\' must be a String but found a "
-                    + map.get("docUrl").getClass().getSimpleName() + " instead");
+                    + map.get("docUrl").getClass().getSimpleName() + " instead (feature affected: '" + featureName + "'). Remember, it is an optional field so you can remove it from the input.");
+        }
+
+        if (map.get("docUrl") != null && !((String) map.get("docUrl")).matches("^(http|https)://.*")) {
+            throw new PricingParsingException("The docUrl field (from feature '" + featureName + "') must be a valid URL with the http or https protocol. Received: " + map.get("docUrl") + ". Remember, it is an optional field so you can remove it from the input.");
         }
 
         guarantee.setDocURL((String) map.get("docUrl"));
@@ -279,7 +293,7 @@ private static void parsePaymentValue(Feature feature, String featureName, Map<S
         for (String paymentType : allowedPaymentTypes) {
             try {
                 PaymentType.valueOf(paymentType);
-            } catch (IllegalArgumentException e) {
+            } catch (NullPointerException | IllegalArgumentException e) {
                 throw new InvalidDefaultValueException("The feature " + featureName
                         + " does not have a valid defaultValue consisting on a list of supported paymentType ("+Arrays.toString(PaymentType.values())+"). PaymentType that generates the issue: " + paymentType);
             }
diff --git a/src/main/java/io/github/isagroup/services/parsing/PlanParser.java b/src/main/java/io/github/isagroup/services/parsing/PlanParser.java
index 663657a..3b8f485 100644
--- a/src/main/java/io/github/isagroup/services/parsing/PlanParser.java
+++ b/src/main/java/io/github/isagroup/services/parsing/PlanParser.java
@@ -103,7 +103,13 @@ private static void setFeaturesToPlan(String planName, Map<String, Object> map,
 
         for (String planFeatureName : planFeaturesMap.keySet()) {
 
-            Map<String, Object> planFeatureMap = (Map<String, Object>) planFeaturesMap.get(planFeatureName);
+            Object planFeatureObj = planFeaturesMap.get(planFeatureName);
+            if (!(planFeatureObj instanceof Map)) {
+                throw new PricingParsingException("The feature " + planFeatureName
+                        + " of the plan " + planName + " is not a valid map. Maybe 'value' attribute is missing to set the value of the feature");
+            }
+            @SuppressWarnings("unchecked")
+            Map<String, Object> planFeatureMap = (Map<String, Object>) planFeatureObj;
 
             if (!plan.getFeatures().containsKey(planFeatureName)) {
                 throw new FeatureNotFoundException(
@@ -188,7 +194,13 @@ private static void setUsageLimitsToPlan(String planName, Map<String, Object> ma
 
         for (String planUsageLimitName : planUsageLimitsMap.keySet()) {
 
-            Map<String, Object> planUsageLimitMap = (Map<String, Object>) planUsageLimitsMap.get(planUsageLimitName);
+            Object planUsageLimitObj = planUsageLimitsMap.get(planUsageLimitName);
+            if (!(planUsageLimitObj instanceof Map)) {
+                throw new PricingParsingException("The usageLimit " + planUsageLimitName
+                    + " of the plan " + planName + " is not a valid map. Maybe 'value' attribute is missing to set the value of the usageLimit");
+            }
+            @SuppressWarnings("unchecked")
+            Map<String, Object> planUsageLimitMap = (Map<String, Object>) planUsageLimitObj;
 
             if (!plan.getUsageLimits().containsKey(planUsageLimitName)) {
                 throw new FeatureNotFoundException(
@@ -196,7 +208,16 @@ private static void setUsageLimitsToPlan(String planName, Map<String, Object> ma
             } else {
                 UsageLimit usageLimit = plan.getUsageLimits().get(planUsageLimitName);
 
-                Object value = planUsageLimitMap.get("value");
+                Object value = null;
+                try{
+                    value = planUsageLimitMap.get("value");
+                }
+                catch (NullPointerException e){
+                    throw new InvalidDefaultValueException("The usageLimit " + planUsageLimitName
+                        + " does not have a valid value. Current valueType: "
+                        + usageLimit.getValueType().toString() + "; Current value in plan " + plan.getName() + " is null");
+                }
+
                 boolean isValueNull = (value == null);
                 
                 if (isValueNull){
@@ -251,7 +272,7 @@ public static void parsePaymentValue(Feature feature, String featureName, Map<St
         for (String type : allowedPaymentTypes) {
             try {
                 PaymentType.valueOf(type);
-            } catch (IllegalArgumentException e) {
+            } catch (NullPointerException | IllegalArgumentException e) {
                 throw new InvalidDefaultValueException(
                     "Invalid payment type for feature \"" + featureName + "\": \"" + type + "\" is not a supported payment type. "
                     + "Supported types are: " + Arrays.toString(PaymentType.values()) + ". "
diff --git a/src/main/java/io/github/isagroup/services/parsing/PricingManagerParser.java b/src/main/java/io/github/isagroup/services/parsing/PricingManagerParser.java
index c7b66b1..4a6ee43 100644
--- a/src/main/java/io/github/isagroup/services/parsing/PricingManagerParser.java
+++ b/src/main/java/io/github/isagroup/services/parsing/PricingManagerParser.java
@@ -342,7 +342,10 @@ private static void setPlans(Map<String, Object> map, PricingManager pricingMana
     }
 
     private static void setAddOns(Map<String, Object> map, PricingManager pricingManager) {
-        Map<String, Object> addOnsMap = (Map<String, Object>) map.get("addOns");
+        Map<String, Object> addOnsMap = null;
+        if (map.get("addOns") instanceof Map) {
+            addOnsMap = (Map<String, Object>) map.get("addOns");
+        }
 
         if (addOnsMap == null) {
             return;
@@ -356,7 +359,7 @@ private static void setAddOns(Map<String, Object> map, PricingManager pricingMan
                 AddOn addOn = AddOnParser.parseMapToAddOn(addOnName, addOnMap, pricingManager);
 
                 pricingManager.getAddOns().put(addOnName, addOn);
-            } catch (ClassCastException e) {
+            } catch (ClassCastException | NullPointerException | IllegalArgumentException e) {
                 throw new PricingParsingException(
                         "An error has occurred while parsing the add-on " + addOnName + ". Error: " + e.getMessage());
             }
diff --git a/src/main/java/io/github/isagroup/services/parsing/UsageLimitParser.java b/src/main/java/io/github/isagroup/services/parsing/UsageLimitParser.java
index a4c73eb..a116f33 100644
--- a/src/main/java/io/github/isagroup/services/parsing/UsageLimitParser.java
+++ b/src/main/java/io/github/isagroup/services/parsing/UsageLimitParser.java
@@ -47,7 +47,7 @@ public static UsageLimit parseMapToUsageLimit(String limitName, Map<String, Obje
                 default:
                     return null;
             }
-        } catch (IllegalArgumentException e) {
+        } catch (NullPointerException | IllegalArgumentException e) {
             throw new IllegalArgumentException("The usage limit " + limitName
                     + " does not have a supported type (" + Arrays.toString(UsageLimitType.values()) + "). Current type value: " + (String) limitMap.get("type"));
         }
@@ -96,7 +96,7 @@ private static void loadBasicAttributes(UsageLimit limit, String limitName, Map<
         limit.setDescription((String) map.get("description"));
         try {
             limit.setValueType(ValueType.valueOf((String) map.get("valueType")));
-        } catch (IllegalArgumentException e) {
+        } catch (NullPointerException | IllegalArgumentException e) {
             throw new InvalidValueTypeException("The feature " + limitName
                     + " does not have a supported valueType (" + Arrays.toString(ValueType.values()) + "). Current valueType: " + (String) map.get("valueType"));
         }
diff --git a/src/test/resources/negative-parsing-tests.csv b/src/test/resources/negative-parsing-tests.csv
index b77a384..4b6f0ee 100644
--- a/src/test/resources/negative-parsing-tests.csv
+++ b/src/test/resources/negative-parsing-tests.csv
@@ -31,7 +31,7 @@ Throw an error if 'currency' is missing;parsing/negative/currency/currency-is-nu
 Throw an error if a feature is not a map of attributes;parsing/negative/feature/feature-is-key-value.yml;Feature 'foo' must be a Map but found String instead
 Throw an error if a feature is named 'null';parsing/negative/feature/feature-null-as-key.yml;A feature cannot have the name null
 # feature.docUrl
-Throw an error if feature 'docUrl' is not a string;parsing/negative/feature/docUrl/is-bool.yml;'docUrl' must be a String but found a Boolean instead
+Throw an error if feature 'docUrl' is not a string;parsing/negative/feature/docUrl/is-bool.yml;'docUrl' must be a String but found a Boolean instead (feature affected: 'guarantee'). Remember, it is an optional field so you can remove it from the input.
 # feature.type
 Throw an error if feature 'type' is missing or null;parsing/negative/feature/type/null-type.yml;feature 'type' is mandatory
 # feature.valueType