When scheduling tonight, I got the message that there was a problem removing the hour 21:00 on 30 March.  After clicking on OK it went on to complete the rest of the schedule. 

I have had this before but cannot remember what I did to solve it.  It could have been a compacting of q-nxt database, but I'm not sure I remember doing that.  Is there another way to clear this error? 

We use Autotrack/Myriad version 2.6

Neil