can't use non-numeric string as operand of "&"
    while executing
"if { $bin & 1 } {
		lappend lists "FL"
	}"
    (procedure "process_msnp11_lists" line 10)
    invoked from within
"process_msnp11_lists $list_names"
    (procedure "::NS::Snit_methodhandleLST" line 45)
    invoked from within
"$self handleLST $command"
    ("LST" arm line 3)
    invoked from within
"switch [lindex $command 0] {
				ILN {
					if {$::msnp13} {
						$self handleILN $command
					} else {
						cmsn_ns_handler $command $message
				..."
    (procedure "::NS::Snit_methodhandleCommand" line 27)
    invoked from within
"$options(-name) handleCommand $command"
    (procedure "::Connection::Snit_methodreceivedData" line 44)
    invoked from within
"ns receivedData"