[SOLVED] “Could not open /dev/vmmon: No such file or directory” Error in Mac OS X

The problem

When trying to open a virtual machine for the very first time, after installing VMWare Fusion in a fresh installation of OS X, I am receiving the error “Could not open /dev/vmmon: No such file or directory”.

The solution

This is usually due to the security restrictions about identified developers of Mac OS X applications, to solve it just go to System Preferences > Security & Privacy  and verify if VMWare is allowed to run and there is no mentioning of a blocked application.

That’s it! From now on VMWare should run smoothly.

See you next time!

Alex Arriaga

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4 comments on “[SOLVED] “Could not open /dev/vmmon: No such file or directory” Error in Mac OS X”

  1. Mine wasn’t working, nothing was showing up in System Prefs as being not allowed. Restarted the Mac and it worked though.

  2. While this might help a small number of people, more likely the problem is with the kernel extension manager. You have to boot into recovery mode, find where your disk is mounted (with terminal) and remove /private/var/db/KernelExtensionManager which will be re-created with the correct permissions upon reboot. This solves it for most people.

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