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Why is my developer console getting a JS error, containerID is undefined?

The developer console on instance cs11 has the following JS error:
"Failed to create createContainerMember for conatinerId=undefined: null is not a valid containerId."

I can create triggers and classes but cannot save the body.  The error pops up every minute or so.  Salesforce, please fix

Seems the error is related to this:
Best Answer chosen by SFDC-NOOB
  • Please create a new workspace from the Developer Console
  • Go to Developer Console -> Work Space -> New Workspace
  • Create a new workspace
  • Save classes/triggers