problem with post moving
 

When i try to move some post to Existing Thread by "Move Posts to Existing Thread" option then i have this alert: "You have not specified a valid URL for the thread that you want to merge. Please check that the URL includes a valid threadid* "t=xxx" or postid* "p=xxx" (where xxx is a number)* and is not a redirect."

I am using vbseo on my site.