fix

app.py

@@ -108,7 +108,7 @@ def _call_api(api_url: str, file_path: str, use_layout_detection: bool, prompt_l
     except json.JSONDecodeError:
         raise gr.Error(f"Invalid JSON response from server:\n{getattr(resp, 'text', '')}")
     if data.get("errorCode", -1) != 0:
-        raise gr.Error(f"API returned an error:}")
+        raise gr.Error(f"API returned an error:")
     return data
 
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