How to create an init method with executeEmptyRowSet() in task flow

hi i try this <method-call id="Empty">
<method>executeEmptyRowSet()</method>
</method-call> in my task flow but am geting error
am in jdeveloper 11.1.1.6.0

1) In your Application module, create a public method in service class.
2) In that method you do your executeEmptyRowSet() on the view objects you want to.
3) Expose the method (AM > Services > Client interface).
4) Drag the method from your DataControl onto you taskflow.
5) Right click that method > Mark Activity > Default

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