The script code in your extension generated a stack overflow. Probably means that the extension run-time envornment crashed.
You may have done one or more of the following:
- used an old version of the extension
- used an unsupported or antique browser
- made this extension do something for which is was not intended
- called a method with wrong or missing parameters
- passed too much data as a parameter to an unsuspecting routine
- ...
