Fixing "Could not load file or assembly Caliburn.Micro" Error

If you ever happen across this error in your Epicor 10 ERP installation when trying to edit a BPM:

Could not load file or assembly 'Caliburn.Micro, Version=2.0.2.0, Culture=neutral, PublicKeyToken=8e5891231f2ed21f' or one of its dependencies. The system cannot find the file specified.

It probably means that something didn’t go quite right in the client update process. There is a simple fix, though. Go to the client deployment folder on your Epicor server (for example \\epicor\ERP10.2.100.0Deployment\Client) and copy the files with names that start with ‘Caliburn.Micro’ (there should be 4 of them) to your Epicor client folder. Next time you reopen Epicor this problem should go away.