You're not missing anything. There's a bug report on the rt that mentions the exact same problem. See: Bug #40185 for File-NSLock. You'll find an attachment with a patch that should work for you.

In reply to Re^3: Before I give-up on Chart::Clicker..... by Khen1950fx
in thread Before I give-up on Chart::Clicker..... by ChuckBland

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