diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index f741e19bd..5e0d3ff28 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -47,6 +47,10 @@ class FinishReasonLength(Exception):
     pass
 
 
+class UnableToCountRepoFiles(Exception):
+    pass
+
+
 def wrap_fence(name):
     return f"<{name}>", f"</{name}>"