Update Gradio_UI.py

Gradio_UI.py

@@ -27,7 +27,7 @@ class GradioUI:
                 # The document_qna_tool expects a file path string.
                 print("Detected PDF upload and query. Calling document_qna_tool...")
                 # The tool signature is document_qna_tool(pdf_path: str, question: str)
-                response = self.agent.tools[4](pdf_file.name, query)
+                response = self.agent.tools["document_qna_tool"](pdf_file.name, query)                
                 print("Document Q&A tool finished.")
                 # Optional: Clean up the uploaded file after processing
                 # import os