This error is because VMWare Fusion has not been given permission to run in your personal settings on your Mac.
Open VMWare Fusion and start your manual. You will get the error of loading the vmmon kernel module.
Close VMWare Fusion.
Go To ‘System Preferences’ >> ‘Security & Privacy’ >> Check if you are allowed to run apps from identified developers and there is no mentioning of a block application.
VMWare Fusion will probably be blocked, and after allowing it, the problem with the kernel module should be resolved.