fix non pickable object

app.py

@@ -122,7 +122,7 @@ class MyEmbeddingFunction(EmbeddingFunction):
         metadata = [item[1] for item in embeddings_with_metadata]  
         embeddings_flattened = [emb for sublist in embeddings for emb in sublist]  
         metadata_flattened = [meta for sublist in metadata for meta in sublist]  
-        return embeddings_flattened, metadata_flattened   
+        return embeddings_flattened, metadata_flattened  
   
 def load_documents(file_path: str, mode: str = "elements"):  
     loader = UnstructuredFileLoader(file_path, mode=mode)