Error - moving a post (SQL)

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   I recently migrated my forum from access to sql at svpworld, everything seems to be running smoothly. However I just tried to move a post to another forum and give it a new topic, but I get this error in the pop up...
Microsoft OLE DB Provider for SQL Server error '80040e2f' 
Cannot insert the value NULL into column 'Priority', table 'svpforum.dbo.tblTopic'; column does not allow nulls. INSERT fails. 
/forum/move_post.asp, line 159 
Anyone have an idea of the problem?
Simon Williams