Gmail trash folder error message

How do I resolve the following error?  

09:31:27 *********** [IMAP]  MailClient.Storage.Application.OperationException: Unable to create folder “************” on the server. ([ALREADYEXISTS] Duplicate folder name (Failure))

I have tried different settings in Gmail but can’t fix it myself.

I forgot to say that I can’t delete emails from my gmail inbox using the bin icon or right click>delete but can drag and drop to Bin or Trash, I have no problems with my other email provider account.