Site not working – function.php & "get_template_directory"

Hi there

Please see my site below:
https://www.blink182guitarlessons.com

I think I either accidentally changed or deleted a file using FTP and I am now shown the above message at my site. I cannot login or do ANYTHING else.

I completely uninstalled word press from my site and removed ALL files from my folders using FTP. However when I reinstall WordPress and install then activate a new theme I always get the message shown at the link above.

I check my folders for the file functions.php and it is present in the directory listed in the error. The message points to “line 3” which I believe is:

“load_theme_textdomain(‘eStore’,get_template_directory().’/lang’);”

Is this the part which is not working? And if so, how can I fix this??

Thanks
Rich