Monitoring Template - NotFound: low disk space error

I was trying to modify a filesystem threshold on my /Server/Windows/WMI template, but when I click on the template I get a banner at the top that says "NotFound: low disk space error". I am unable to modify the template now. I tried deleting the template from advanced > monitoring template > FileSystem > /Server/windows/WMI, and then copy a local copy of the same template I had back to /Server/windows/WMI but the same error returns. Is there a way to set a monitoring template back to default?

Zenoss 4.2.4.