empty folders - Time Warner Internet

This question is about "empty folders", with Time Warner Cable internet and apps. I cannot empty the folders in my email acct. I would like to clear all contents of the delete and inbox folders.. When I click the clear icon, nothing happens and the message
The folder Deleted Messages is unavailable. It may already have been deleted.
appears. Is the system not working correctly or should I do something else?

This topic covered empty folders, and TWC cable internet service.