Update app.py

app.py

@@ -67,7 +67,7 @@ def delete_existing_embedding(file_id):
     if os.path.exists(persist_directory):
         client_settings = chromadb.config.Settings(allow_reset=True)
         vector_store = Chroma(persist_directory=persist_directory, embedding_function=embeddings,client_settings=client_settings)       
-        vector_store._collection.delete()  # Drop all stored vectors
+        vector_store.delete_collection()  # Drop all stored vectors
 
 def tempUploadFile(filePath,file):
     with open(filePath,'wb') as buffer: