When first using my server yesterday I was able to use whisper lists. I had the button assigned as my mouse 4 button. Then later I was getting "No Whisper Target Found" message, So I erased and tried to remake the whisper list. Now no matter what button, or list content I use I get the same error. Also Every time I try to bind Mouse 4 as anything I get an alert that it is being used, I've cleared all my keybinds and it still gives me the message. When I use the whisper function I get this warning:

Warning Invalid whisperlist UID when starting whisper