Use paddle.disable_static() to replace with dygraph.guard(). (#27139)

python/paddle/fluid/framework.py

@@ -217,7 +217,7 @@ def _dygraph_not_support_(func):
 def _dygraph_only_(func):
     def __impl__(*args, **kwargs):
         assert in_dygraph_mode(
-        ), "We Only support %s in imperative mode, please use fluid.dygraph.guard() as context to run it in imperative Mode" % func.__name__
+        ), "We Only support %s in dynamic mode, please call 'paddle.disable_static()' to enter dynamic mode." % func.__name__
         return func(*args, **kwargs)
 
     return __impl__