fix attempt

providers/base_provider.py

@@ -96,16 +96,21 @@ class BaseProvider(ABC):
         print(f"Initialized {name} provider with session-specific config (rate: {actual_rate_limit}/min)")
 
     def __getstate__(self):
+        """Prepare BaseProvider for pickling by excluding unpicklable objects."""
         state = self.__dict__.copy()
-        # Exclude the unpickleable '_local' attribute
-        if '_local' in state:
-            del state['_local']
+        # Exclude the unpickleable '_local' attribute and stop event
+        unpicklable_attrs = ['_local', '_stop_event']
+        for attr in unpicklable_attrs:
+            if attr in state:
+                del state[attr]
         return state
 
     def __setstate__(self, state):
+        """Restore BaseProvider after unpickling by reconstructing threading objects."""
         self.__dict__.update(state)
-        # Re-initialize the '_local' attribute
+        # Re-initialize the '_local' attribute and stop event
         self._local = threading.local()
+        self._stop_event = None
 
     @property
     def session(self):