diff --git a/process/solver.py b/process/solver.py
index 046d03c97a..269244be62 100644
--- a/process/solver.py
+++ b/process/solver.py
@@ -2,6 +2,7 @@
 
 import logging
 from process.fortran import numerics, global_variables
+from process.utilities.f2py_string_patch import f2py_compatible_to_string
 import numpy as np
 from process.evaluators import Evaluators
 from abc import ABC, abstractmethod
@@ -204,9 +205,12 @@ def _solver_callback(i: int, _result, _x, convergence_param: float):
             res = e.result
 
         except ValueError as e:
-            logger.warning(
-                f"Active iteration variables are : {list(enumerate(numerics.ixc[:numerics.nvar]))}"
-            )
+            itervar_name_list = ""
+            for count, iter_var in enumerate(numerics.ixc[: numerics.nvar]):
+                itervar_name = f2py_compatible_to_string(numerics.lablxc[iter_var - 1])
+                itervar_name_list += f"{count}: {itervar_name} \n"
+
+            logger.warning(f"Active iteration variables are : \n{itervar_name_list}")
             raise e
 
         else: