When I open the junk mail folder in only one of my email accounts, I am not able to remove them all by clicking on the "x".

The error message starts with unknown error occurred. and then when I click Details I get

UID STORE failed

Configuration:
   Account: (internet provider and email address)
   Server: IMAP.(internet provider)
   User name: (email address)
   Protocol: IMAP
   Port: (###)
   Secure(SSL): 0
   Code: 800cccd3
Any ideas how to fix this?

The odd part is I have two other email accounts that work perfectly.

Thanks for your help.

gntlmnjim