Make a note of the drive name for the internal hard drive. This command lists the attached volumes.Type the following command and hit return: ls /Volumes/.In the upper menu click utilities, then select terminal.Boot your broken Mac while holding Command+R until you see the Apple logo.The Fix Option 2 - USB Thumb Stick & Terminal Command: Paste in the file you downloaded above.In the Finder, from the root of the broken mac's hard drive navigate to: /Library/Security/SecurityAgentPlugins/.Connect both macs together via thunderbolt, the broken mac's hard drive will show up as an external HD.Boot the broken mac to target disk mode by holding the T key during boot, until you see the thunderbolt Icon on the screen.

Download the file you need to replace here.

Get another mac that is not the broken one, duh.

Requires a Thunderbolt cable to connect two macs together.

If you receive an error review the steps carefully again, or call us for assistance.

NOTE** if the terminal returns down waiting for a new command, it's successful.

NOTE** once you enter the command hit return to submit the command.

rm '/Volumes/Macintosh HD/var/db/auth.db'

NOTE** Replace with the name of your hard disk from the earlier step. Eg.

Enter the command and hit return: rm '/Volumes/ /var/db/auth.db'.

From the top menu bar click Utilities > Terminal.

If you see the word 'unmount' skip this step.

Click the 'Mount' button in the upper right.

Click to select the disk in the sidebar.

For Macs running Catalina it is the Disk that does not end in '- Data'.

Check the left source list for the name of your disk.

Open Disk Utility - found in the upper utility menu option.

Start into macOS Recovery by holding down Cmd-R when booting before the chime until the apple logo.

SecurityAgent was unable to create requested mechanism TeamViewerAuthPlugin:Start.īasically it's a file that the OS is looking for to boot and it can't find it. Instead it give you an error that reads: 'Unrecoverable Error.

The scenario is that you've uninstalled teamviewer on macOS catalina and now your mac won't boot.

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