XF 2.2 Template Error

I'm trying to edit the login template, however when I do I keep getting the following error:

Code:
Oops! We ran into some problems. Please try again later. More error details may be in the browser console.

I've even tried just opening the template and hitting Save without changing anything. The weird thing is I've been able to modify other templates no problem.

Any idea how to fix this problem?
 
Most likely this:

 
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