Error: print session token is illegal

[sander]

I can't seem to reproduce it, but it happened after I canceled to print an empty whiteboard:

the print session token is illegal
the print session token is illegal
    while executing
"::maccarbonprint::printconfigure $printObj"
    (procedure "maccarbonprint::printcanvas" line 13)
    invoked from within
"maccarbonprint::printcanvas $wcan $printObject"
    ("eval" body line 1)
    invoked from within
"eval {maccarbonprint::printcanvas $wcan $printObject}"
    (procedure "::Mac::MacCarbonPrint::PrintCanvas" line 15)
    invoked from within
"::Mac::MacCarbonPrint::PrintCanvas $w"
    (procedure "::Mac::Printer::Print" line 2)
    invoked from within
"::Mac::Printer::Print $w"
    (procedure "::UserActions::DoPrintCanvas" line 8)
    invoked from within
"::UserActions::DoPrintCanvas $wcan"
    (procedure "OnPrintCanvas" line 2)
    invoked from within
"OnPrintCanvas [GetFrontmostCanvas]"
    (procedure "::WB::OnMenuPrintCanvas" line 3)
    invoked from within
"::WB::OnMenuPrintCanvas"
    (command bound to event)