Service Desk Console/Web Access.
You are in a process record and when you click the "Where Am I?" button you get this error:
Issue #6639 - Orphaned actions lead to display issues within Process Designer and "Where am I" - has been resolved in the 2017.3 release.
There is an orphaned action somewhere in the process. It will look something like this in Process Designer:
Deactivate the process, find the orphaned action, delete it, then save and reactivate the process.
Failing that, run the attached script. Remember to follow normal precautions when running a script on your database (ie, take a backup).