change systemexit to valueerror

python/paddle_serving_client/__init__.py

@@ -177,7 +177,7 @@ class Client(object):
         # create predictor here
         if endpoints is None:
             if self.predictor_sdk_ is None:
-                raise SystemExit(
+                raise ValueError(
                     "You must set the endpoints parameter or use add_variant function to create a variant."
                 )
         else: