Failed to create createContainerMember for containerId=undefined: null is not a valid containerId.

           Some of the user may face this issue while using Developer Console in salesforce. 

"Failed to create createContainerMember for containerId=undefined: null is not a valid containerId."

         Follow the below steps in order to solve this issue, 

1. Go to Developer Console -> Work Space -> New Workspace
2. Create a new workspace
3. Save classes/triggers 

 

Knowledge Article Reference:

 

https://help.salesforce.com/apex/HTViewSolution?id=000204953&language=en_US