Add a readable hint on what happens on unpickling errors

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/python/sectracker/xpickle.py b/lib/python/sectracker/xpickle.py
index d3324825ce..33eba396e9 100644
--- a/lib/python/sectracker/xpickle.py
+++ b/lib/python/sectracker/xpickle.py
@@ -65,6 +65,11 @@ def _wraploader(typ, parser):
                 return (_pickle.load(f), True)
         except (EOFError, IOError, _pickle.PickleError):
             return (None, False)
+        except (AttributeError, KeyError, TypeError) as e:
+            raise RuntimeError(
+                "The pickling format or target classes might have changed. Clean up using e.g."
+                "`find . -name '*xpck' -delete` and try again."
+            ) from e
 
     def check(data, st):
         try: