"This theme file could not be saved"?

[mr_hopp]

When I try to save edits to the globalTemplate file, it gives me an error message "This theme file could not be saved" ... how do I fix that? Thanks for your help!

Here's a quick screen recording of the error: 

 

[Jim M]

Means you have an error in the template (syntax or otherwise) or you have mod_security or something on your server blocking the save action.