Final Cut Library Manager keeps crashing

Yosemite users (OSX 10.10)

Final Cut Library Manager 3.21 (and above) is designed to work with libraries from Final Cut Pro 10.3.x. This version of FCP requires OS X 10.11 (El Capitan) or later, and Final Cut Library Manger follows these requirements.
Yosemite users using and older version of FCP should continue to use version 3.20 of Final Cut Library Manager: Download 3.20

Users of El Capitan (OSX 10.11) and above

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