Task Not Found error in Tribe mode

[jszzang]

OS version : CentOS7
Snap version : 2.0
Environment details (virtual, physical, etc.): Both Virtual & Physical
Steps to reproduce

1. snapteld as tribe mode
2. create an agreement
3. join nodes and load plugins and create a task (any plugins and task)
4. stop and remove the task above
5. recreate the task (should have new task ID)
6. tail -f /var/log/snap/snapteld

Expected results
No error
Actual results
time="2017-11-16T17:31:06+09:00" level=error msg="error stopping task" _block=stop-task _error="Task not found: ID(d2d6bd62-720e-42fc-886c-12f5b0687ef1)" _module=scheduler source=tribe task-id=d2d6bd62-720e-42fc-886c-12f5b0687ef1
time="2017-11-16T17:31:06+09:00" level=error msg="error stopping task" _block=stop-task _error="Task not found: ID(d2d6bd62-720e-42fc-886c-12f5b0687ef1)" _module=scheduler source=tribe task-id=d2d6bd62-720e-42fc-886c-12f5b0687ef1
time="2017-11-16T17:31:06+09:00" level=error msg="error stopping task" _block=stop-task _error="Task not found: ID(d2d6bd62-720e-42fc-886c-12f5b0687ef1)" _module=scheduler source=tribe task-id=d2d6bd62-720e-42fc-886c-12f5b0687ef1
time="2017-11-16T17:31:06+09:00" level=error msg="error stopping task" _block=stop-task _error="Task not found: ID(d2d6bd62-720e-42fc-886c-12f5b0687ef1)" _module=scheduler source=tribe task-id=d2d6bd62-720e-42fc-886c-12f5b0687ef1
time="2017-11-16T17:31:06+09:00" level=error msg="error stopping task" _block=stop-task _error="Task not found: ID(d2d6bd62-720e-42fc-886c-12f5b0687ef1)" _module=scheduler source=tribe task-id=d2d6bd62-720e-42fc-886c-12f5b0687ef1
time="2017-11-16T17:31:07+09:00" level=error msg="error stopping task" _block=stop-task _error="Task not found: ID(d2d6bd62-720e-42fc-886c-12f5b0687ef1)" _module=scheduler source=tribe task-id=d2d6bd62-720e-42fc-886c-12f5b0687ef1

thank you