Update app.py

app.py

@@ -50,6 +50,10 @@ def convert_image_to_dxf(image_file, output_folder=None, use_lines=False):
         if not os.path.exists(output_path):
             return "Conversion failed: DXF file was not created.", None, None
         
+        # Check if the output DXF file exists
+        if not os.path.isfile(output_path):
+            return f"Error: The DXF file was not found at {output_path}.", None, None
+        
         # Clean up temporary folder
         if output_folder and os.path.isdir(output_folder):
             shutil.rmtree(output_folder)