I have fixed this problem, I have to generate a Jar file whith Persona class.
I have another issue now, I have this flow:
start->Human Task1 -> Rule Task -> Huma Task2 -> Email Task -> Human Task3-> end
When i complete human Task 2 trigger Email Task, but Service Task do not get finished, that is the reason why Human Task3 never start.
If I use another flow like:
start->Human Task1 -> Rule Task1 -> Huma Task2 -> Rule Task2 -> Human Task3-> end
It works fine, I would like to know why Email Task does not get ended.
Thanks in advance