Symptoms
We found an error on K2 workspace's error profile.
"Could not load type 'System.Reflection.AssemblySignatureKeyAttribute' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'."
Diagnoses
This error can sometimes occur when Windows performed an update, and the server has not been rebooted.
Resolution
Reboot K2 server