Update app.py

app.py

@@ -276,17 +276,19 @@ async def extract_text_from_mixed_pdf(file_path):
     return pdf_text
 
 # Function to delete the ChromaDB collection
-async def delete_chroma_collection():
-    chroma_instance = await cl.make_async(Chroma)()
-    await chroma_instance.delete_collection()
+async def delete_chroma_collection(chroma_instance):
+    chroma_instance.delete_collection()
 
 @cl.on_chat_start
 async def on_chat_start():
     
     files = None # Initialize variable to store uploaded files
 
+    # Initialize ChromaDB
+    chroma_instance = await cl.make_async(Chroma.from_texts)([], None)
+
     # Delete the existing ChromaDB collection
-    await delete_chroma_collection()
+    await delete_chroma_collection(chroma_instance)
 
     # Wait for the user to upload a file
     while files is None: