Permission error when start Fusion VM

Error

When trying to start a newly created virtual machine in VMware Fusion, following error occurred

Error: Could not open /dev/vmmon...

This is because Fusion has no permssion to open device file required.

Steps

• Navigate to System Preferences > Security & Privacy on the host macOS (High Sierra, Mojave and Catalina).
• Under the General tab towards the bottom of the window, you see error similar to following message with option to click on “Allow”:

System software from vendor "VMware, Inc." was blocked from loading.

• Click Allow.
• Restart Fusion, and start virtual machine again.
• If some other permission errors occurr again, repeat above steps.

References

Error: Could not open /dev/vmmon: Broken pipe, while launching the Virtual Machine (80467)