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I get "Suitcase Fusion has detected an incompatible version of FMCore" when I try to open Suitcase Fusion for Mac OS

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Jay
  • Updated

Problem

When I try to open Suitcase Fusion for Mac OS, I get the following error message: “Suitcase Fusion has detected an incompatible version of FMCore. Suitcase Fusion can not continue.”

Environment

This article covers all versions of Suitcase Fusion running on all supported versions of Mac OS.

Resolution

If you have just upgraded from a previous version of Suitcase Fusion, the type core from the previous version does not get shut down properly in some cases, and the new version of Suitcase cannot connect to it. Restarting your Mac resolves the problem.

You can stop the Suitcase Fusion type core, then remove the contents of the .Extensis folder and the preference files by hand. After that, Suitcase Fusion should open correctly.

Stopping the Suitcase Fusion type core

  1. Open Activity Monitor (/Applications/Utilities/Activity Monitor)
  2. Look for any FMCore processes; if you find any, force them to quit (View > Quit Process)

Removing the contents of the .Extensis folder

  1. In the Finder, choose Go > Go To Folder
  2. In the "Go to the folder" field, enter "~/.Extensis" and click Go
  3. Drag the FMCore folder to the Trash

go-to-extensis-folder.png

Removing Suitcase Fusion preference files

Go to /Users/username/Library/Extensis/ and drag the com.extensis.FMCore-LaunchInfo.conf file to the Trash. Then, go to /Users/username/Library/Preferences/ and drag the following files to the Trash, if present:

      • com.extensis.SuitcaseFusion.db
      • com.extensis.SuitcaseFusion7.plist
      • com.extensis.SuitcaseFusion6.plist
      • com.extensis.SuitcaseFusion5.plist
      • com.extensis.SuitcaseFusion4.plist
      • com.extensis.SuitcaseFusion.plist

Open Suitcase Fusion; it should open successfully.

NOTE: By default, the user’s Library folder is not visible in the Finder. To reach the Library folder, hold the Option key down and click on the Go menu in the Finder; there will now be a “Library” menu option with no keyboard shortcut.

The Library option in the Finder's Go menu is selected

Selecting “Library” takes you to the user’s Library folder.

Cause

Suitcase Fusion stores background process information for the type core in a hidden folder named “.Extensis” in your home folder. In some cases, that information does not get cleared when Suitcase Fusion quits. In rare cases, a damaged preference file will keep Suitcase Fusion from connecting to the type core.

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