iMovie suddenly can't share

The Compressor Kit Error message has been reported with increasing frequency of late. No universal fix so far. The fix that has worked the most has been starting up in Safe Mode (see Finder menu for instructions) and then after everything loads immediately shutting down and rebooting in normal mode.

Here's a link, though older, that pretty much describes where we are today with the Compressor Kit Error:

https://discussions.apple.com/thread/8265338

There may be some proposed solutions in the above link that will work for you.

-- Rich

The Compressor Kit Error message has been reported with increasing frequency of late. No universal fix so far. The fix that has worked the most has been starting up in Safe Mode (see Finder menu for instructions) and then after everything loads immediately shutting down and rebooting in normal mode.

Here's a link, though older, that pretty much describes where we are today with the Compressor Kit Error:

https://discussions.apple.com/thread/8265338

There may be some proposed solutions in the above link that will work for you.

-- Rich

Try upgrading or doing a fresh install of your OS, plus an updating of your iMovie app. That worked for one recent poster, who upgraded to Mojave and the updated to iMovie 10.1.14. Try just updating iMovie first.

— Rich