fix the conflict

x2paddle/core/program.py

@@ -637,4 +637,5 @@ class PaddleGraph(object):
             if str(e) == "'target_vars' should be a list of Variable.":
                 print("[DyGraph2StaticGraph Error] Can not convert the dygraph to static! The output of PyTorch mustbe Variable or a list of Variable.")
             else:
-                print(e)
\ No newline at end of file
+                print(e)
+                exit(0)
\ No newline at end of file