diff --git a/lark-stubs/exceptions.pyi b/lark-stubs/exceptions.pyi
index 587d60a..08f7b3e 100644
--- a/lark-stubs/exceptions.pyi
+++ b/lark-stubs/exceptions.pyi
@@ -9,6 +9,10 @@ class LarkError(Exception):
     pass
 
 
+class ConfigurationError(LarkError, ValueError):
+    pass
+
+
 class GrammarError(LarkError):
     pass
 
diff --git a/lark/exceptions.py b/lark/exceptions.py
index c25cf4f..72f6c6f 100644
--- a/lark/exceptions.py
+++ b/lark/exceptions.py
@@ -14,9 +14,6 @@ class ConfigurationError(LarkError, ValueError):
 class GrammarError(LarkError):
     pass
 
-class GrammarError_Value(LarkError):
-    pass
-
 
 class ParseError(LarkError):
     pass