How do I disable the Mouse?

I am attempting to make a game that utilizes the the mouse to look around and one issue I have come across is the way the mouse can move offscreen,

I downloaded the MouseLock plugin seen here:

The problem with that is I get this error when I activate the plugin.

Is there any other way to get the mouse to lock onto the screen?

Is this for a browser game or desktop?

If it's for a browser, it's probably best to allow the user to click off the game (this is a convention for browser objects), so making the cursor invisible is a better idea.

For desktop, fullscreen should make the mouse bound to the window.

Is there any reason you need the mouse to not be able to move at all?