diff --git a/src/backend/langflow/api/v1/base.py b/src/backend/langflow/api/v1/base.py
index 557395558..28be40ae0 100644
--- a/src/backend/langflow/api/v1/base.py
+++ b/src/backend/langflow/api/v1/base.py
@@ -77,7 +77,7 @@ def validate_prompt(template: str):
 def check_input_variables(input_variables: list):
     invalid_chars = []
     fixed_variables = []
-    wrong_variables = set()
+    wrong_variables = []
     empty_variables = []
     for variable in input_variables:
         new_var = variable
@@ -92,17 +92,14 @@ def check_input_variables(input_variables: list):
         if variable[0].isdigit():
             invalid_chars.append(variable[0])
             new_var = new_var.replace(variable[0], "")
-            wrong_variables.add(variable)
-
-        for char in INVALID_CHARACTERS:
-            if char in variable:
-                invalid_chars.append(char)
-                new_var = new_var.replace(char, "")
-                wrong_variables.add(variable)
+            wrong_variables.append(variable)
+        else:
+            for char in INVALID_CHARACTERS:
+                if char in variable:
+                    invalid_chars.append(char)
+                    new_var = new_var.replace(char, "")
+                    wrong_variables.append(variable)
         fixed_variables.append(new_var)
-        # if new_var != variable and new_var not in input_variables:
-        #     input_variables.remove(variable)
-        #     input_variables.append(new_var)
     # If any of the input_variables is not in the fixed_variables, then it means that
     # there are invalid characters in the input_variables
 
@@ -122,17 +119,20 @@ def build_error_message(
     input_variables, invalid_chars, wrong_variables, fixed_variables, empty_variables
 ):
     input_variables_str = ", ".join([f"'{var}'" for var in input_variables])
-    error_string = f"Invalid input variables: {input_variables_str}."
+    error_string = f"Invalid input variables: {input_variables_str}. "
 
     if wrong_variables and invalid_chars:
-        ", ".join([f"'{var}'" for var in wrong_variables])
-        invalid_chars_str = ", ".join([f"'{char}'" for char in invalid_chars])
-        error_string += (
-            f" Please, remove the invalid characters: {invalid_chars_str}"
-            " from the variables: {wrong_variables_str}."
-        )
+        # fix the wrong variables replacing invalid chars and find them in the fixed variables
+        error_string_vars = "You can fix them by replacing the invalid characters: "
+        wvars = wrong_variables.copy()
+        for i, wrong_var in enumerate(wvars):
+            for char in invalid_chars:
+                wrong_var = wrong_var.replace(char, "")
+            if wrong_var in fixed_variables:
+                error_string_vars += f"'{wrong_variables[i]}' -> '{wrong_var}'"
+        error_string += error_string_vars
     elif empty_variables:
         error_string += f" There are {len(empty_variables)} empty variable{'s' if len(empty_variables) > 1 else ''}."
     elif len(set(fixed_variables)) != len(fixed_variables):
-        error_string += " There are duplicate variables."
+        error_string += "There are duplicate variables."
     return error_string