ZCM 11 SP1 Server + Agent installed.

Workstations is Microsoft Windows 7 Professional Edition x64 6.1.7601
Service Pack 1 Build 7601

I am getting hundrets of error messages in Message-Log:

Failed to perform quicktask. The agent will complete the allocated work
during the next device refresh.

I have no idea what i can do.

Any suggestions?

Thank you in advance