Update app.py

app.py

@@ -55,7 +55,7 @@ def get_json_file(json_docs):
     temp_dir = tempfile.TemporaryDirectory()
     temp_filepath = os.path.join(temp_dir.name, json_docs.name)
     with open(temp_filepath, "w", encoding="utf-8") as f:
-        f.write(json_docs.getvalue())
+        f.write(str(json_docs.getvalue()))
     json_loader = JSONLoader(
         file_path=temp_filepath,
         jq_schema='.messages[].content',