Invalid Data Action error is issued in the following situations:
<Data Action> must set a value to the <Output Parameter> output parameter.
You have a Data Action that does not set the value of the Output Parameter.
Assign a value of the correct type to the Output Parameter.
<Data Action> must have at least one output parameter.
You have a Data Action that does not have any Output Parameters.
Create at least one Output Parameter on the Data Action and assign values of the correct types to the new Output Parameters.
Double-click on the error line to take you directly to the source of the error.