diff --git a/app/api/api_design_pre_processing.py b/app/api/api_design_pre_processing.py
index eb2f3ab..f260e22 100644
--- a/app/api/api_design_pre_processing.py
+++ b/app/api/api_design_pre_processing.py
@@ -30,7 +30,7 @@ def design_pre_processing(request_data: DesignPreProcessingModel):
         }
     """
     try:
-        logger.info(f"design_pre_processing request item is : @@@@@@:{json.dumps(request_data)}")
+        logger.info(f"design_pre_processing request item is : @@@@@@:{json.dumps(request_data.dict())}")
         server = DesignPreprocessing()
         data = server.pipeline(image_list=request_data.sketches)
         logger.info(f"design response @@@@@@:{json.dumps(data)}")