Mercurial error “The filename, directory name, or volume label syntax is incorrect”

I'm getting the following error when I try to update my Mercurial directory on a PC:

The filename, directory name, or volume label syntax is incorrect.

Other comments have noted that the problem lies with having ampersands or carets in the path. However my path is this:

C:\Users\First Last\Desktop\goodmorningcmc

That doesn't have any ampersands.

Is it possible that the error is being caused by the space in my username? This is a really frustrating error.

Thanks, Kevin