I've imported an AGP file and when I try to sort my contig list by the Scaffold column, I get the following error:

can't read "::tablelist::ns.list_contigs.list::data(4-sortOrder)": no such element in array
can't read "::tablelist::ns.list_contigs.list::data(4-sortOrder)": no such element in array
    while executing
"tablelist::sortByColumn .list_contigs.list 5"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 $data(-labelcommand) [list $win $col]"
    (procedure "tablelist::labelB1Up" line 66)
    invoked from within
"tablelist::labelB1Up   .list_contigs.list.hdr.t.f.l5 1270"
    (command bound to event)