diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 9893f475d..9bdd89f4b 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -22,7 +22,8 @@ from typing import List
 from aider import __version__, models, prompts, urls, utils
 from aider.analytics import Analytics
 from aider.commands import Commands
-from aider.exceptions import LiteLLMExceptions, UnknownEditFormat
+from aider.exceptions import LiteLLMExceptions
+from aider.coders.base_coder import UnknownEditFormat
 from aider.history import ChatSummary
 from aider.io import ConfirmGroup, InputOutput
 from aider.linter import Linter
@@ -37,6 +38,14 @@ from ..dump import dump  # noqa: F401
 from .chat_chunks import ChatChunks
 
 
+class UnknownEditFormat(ValueError):
+    def __init__(self, edit_format, valid_formats):
+        self.edit_format = edit_format
+        self.valid_formats = valid_formats
+        super().__init__(
+            f"Unknown edit format {edit_format}. Valid formats are: {', '.join(valid_formats)}"
+        )
+
 class MissingAPIKeyError(ValueError):
     pass