Fix CrashPlan’s Error: Logged Out By Authority. Invalid Application State

Do you use CrashPlan to backup your Mac? After migrating to a new Mac have you experienced CrashPlan giving the following error message?

Logged Out By Authority. Invalid Application State.

If so, here are general instructions on how to fix this problem.

Sign in to your account at CrashPlan’s web site.

Download the most current installer for CrashPlan.

Use the uninstaller application that’s provided with the installer to uninstall CrashPlan from your Mac.

Remove the CrashPlan folder and its contents, if they exist, from the two following locations: /Library/Application Support/ and ~/Library/Application Support/

Use the CrashPlan installer application to install CrashPlan.

Open CrashPlan. You should be prompted to go through the process of setting up the Mac as a new device or transferring from an existing device. Most likely, you want to transfer from an existing device. Follow the prompts to complete the process. You’ll likely be prompted to sign-in a couple of times as well.