Garrys Mod Launch Error

I’ve recently uninstalled Garrys Mod , and now re-installed it but once I launch it. It comes up with this error

What programs do you have running?

I heard software from IObit causes this error, try uninstalling any IObit software if you have any installed.

Its not your fault gmod 13 still in beta case so you can recive random errors.

Or. You have alot of mods/addons try removing some.
My opinion.

It’s not in beta anymore? What?