Untag not working C# // error CS0201: Only assignment, call, increment, decrement etc...

I’m new to Unity and I am currently following a FPS tutorial on youtube:

Unity 3d: Simple First-Person Shooter Tutorial - Part 6 by quill18creates

The problem I’m having is that, when the script tries to ‘untag’ an object, it states error CS0201.

You can view the script he writes in the video at 21:00

PLEASE HELP!

or you could just paste your code in and we can spot the syntax typo… ([ code] [ /code] tags when pasting in code, sticky about that at the top of the scripting forum)