Kanboard error AutoSubTasks

Hello,
i have a problem.
in my log there is a message: [error] Kanboard\Core\Action\ActionManager::attachEvents: Automatic Action Not Found: \Kanboard\Plugin\AutoSubtasks\Action\AutoCreateSubtaskVanilla

anyone can help me?
thank you.

Problem solved, AutoSubtasks plugin make an error in projects.
deleted an re-created the action solved the problem.