*HELP* Error: Reference to invalid character at line 3

All of my saved project give me this exact same error and I do not know how to fix it and I cant open any of the projects(mainly the one I want to open is a cover by me of X-Kid Green Day)
X-Kid.aup (12.4 KB)

I can’t see anything wrong with the syntax of the file.

The file was created by Audacity 2.0.5 but what version of Audacity are you using now? And what version of Windows?

I would install or reinstall the latest 2.1.0 from http://web.audacityteam.org/download/windows/. Be sure to put a tick (checkmark) in the Reset Preferences box half way through the installation then say yes when Audacity asks if you want to reset preferences.

Use File > Open… to open the project.