1.2.7 is a bugfix for a bug introduced in 1.2.6. In 1.2.6 I had accidentally left in "use Tk::DirSelect;" when I was doing some testing. DirSelect is not a standard module so it will cause air to fail on execution if the module doesn't exist. You can either comment out that line in 1.2.6 or download 1.2.7. Sorry for the problems.
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