updated the gradio inputs to file

app.py

@@ -37,7 +37,7 @@ def qa_system(pdf_files, openai_key, prompt, chain_type , k):
 
     # get the result
     result = qa({"query": prompt})
-    return result['result'], ''.join(doc.page_content for doc in rest["source_documents"])
+    return result['result'], ''.join(doc.page_content for doc in result["source_documents"])
 
 # define the Gradio interface
 input_file = gr.File(file_count="multiple",label="PDF File")