[opencms-dev] Workflow don`t worked in OC 6.0 alpha 3?

[Dmitry]

Hello All.
Where I try choose Workflow I receive next message:

org.opencms.main.CmsException: User method taskList in calling class
com.opencms.workplace.CmsTaskContent was found but could not be invoked.
java.lang.ClassCastException

Requested resource: /system/workplace/action/tasks_content.html
OpenCms version: 6.0 alpha 3 Caladan
OpenCms context: /opencms/opencms

Any point?