I am getting the error "ERROR FieldInstantiator : couldn't instantiate type 'org.jbpm.graph.def.ActionHandler' with the default constructor" when i am trying to run the test programe after adding action.

http://docs.jboss.com/jbpm/v3/gpd/completing.html#action_configuration

I am using GPD . Eclipse pos a window when i try to add action to the process filesaying there is a error.see the log file. but it did added the code to xml file.

Any idea please ?

Thanks
Sudhakar