If you have Lytro Desktop installed on that computer, and you've used the camera with it, Lytro Desktop will automatically pull the calibration data to a default location. If this is the case, Power Tools should automatically use this default location for calibration and you shouldn't need to specify --calibration-in as an argument.

If you're running an issue, please copy/paste output from the error and post to the Power Tools forums.

You can manually verify that the calibration data is in the default location:

• OS X: /Users/username/Library/Application Support/Lytro/cameras
• Windows: C:\Users\username\AppData\Local\Lytro\cameras