FIX: Use correct identifiable in error message

src/caoscrawler/sync_node.py

@@ -103,8 +103,8 @@ class SyncNode:
                     "The SyncNode that is used with update must have an equivalent"
                     f" identifiable. I.e. you cannot merge entities with differing identifiables"
                     "The identifiables where:\n"
-                    f"{Identifiable._create_hashable_string(self)}\n"
-                    f"and\n{Identifiable._create_hashable_string(other)}."
+                    f"{self.identifiable._create_hashable_string(self.identifiable)}\n"
+                    f"and\n{other.identifiable._create_hashable_string(other.identifiable)}."
                 )
 
         if other.identifiable: