tkdiff error on 10.8.2

[Yu Chen]

Hello,

I have just installed tkdiff, but upon launch, it quits with the following
error, wondering if anybody has any idea. The same tkdiff works fine on
10.7.5. Thanks for your help.

==================
actual font: -family Monaco -size 11 -weight normal -slant roman -underline
0 -overstrike 0
Error in startup script: bad class "movableDBoxProc": must be alert,
moveableAlert, modal, moveableModal, floating, document, utility, help,
sheet, toolbar, plain, overlay, sheetAlert, altPlain, simple, or drawer
    while executing
"tk::unsupported::MacWindowStyle style $toplevel movableDBoxProc"
    (procedure "setAquaDialogStyle" line 2)
    invoked from within
"setAquaDialogStyle $w(newDiffPopup)"
    (procedure "newDiffDialog" line 26)
    invoked from within
"newDiffDialog"
    (procedure "main" line 14)
    invoked from within
"main"
    (file "/opt/local/bin/tkdiff" line 9516)actual font: -family Monaco
-size 11 -weight normal -slant roman -underline 0 -overstrike 0
Error in startup script: bad class "movableDBoxProc": must be alert,
moveableAlert, modal, moveableModal, floating, document, utility, help,
sheet, toolbar, plain, overlay, sheetAlert, altPlain, simple, or drawer
    while executing
"tk::unsupported::MacWindowStyle style $toplevel movableDBoxProc"
    (procedure "setAquaDialogStyle" line 2)
    invoked from within
"setAquaDialogStyle $w(newDiffPopup)"
    (procedure "newDiffDialog" line 26)
    invoked from within
"newDiffDialog"
    (procedure "main" line 14)
    invoked from within
"main"
    (file "/opt/local/bin/tkdiff" line 9516)
==================
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