Outbox error message

Win10 up to date.
Since the last update 8.2.1237 I have an error popup every time I close EmClient, this is both menu>exit and RH top X
I have 2 accounts - one btinternet.com (pop3) and one outlook.com.
There is nothing in outbox.
Screenshot EmClient

Check for a 2nd Outbox under Local Folders

Doh :grin:
Thank you