fix a bug

Rodin.py

@@ -167,8 +167,14 @@ class Generator:
                 raise gr.Error("Error in image preprocessing, please try again.")
 
             if 'error' in preprocess_response:
-                log("ERROR", f"Error in image preprocessing: {preprocess_response['error']}")
-                raise RuntimeError
+                log("ERROR", f"Error in image preprocessing: {preprocess_response}")
+                raise gr.Error("Error in image preprocessing, please try again.")
+            elif preprocess_response.get("statusCode") == 400:
+                if "InvalidFile.Content" in preprocess_response.get("message"):
+                    raise gr.Error("Invalid Image Format")
+                else:
+                    log("ERROR", f"Error in image preprocessing: {preprocess_response}")
+                    raise gr.Error("Busy connection, please try again later.")
             elif preprocess_response.get("statusCode") == 401:
                 log("WARNING", "Token expired. Logging in again...")
                 _, self.token = login(self.user_id, self.password)