500 error

Hey there!

I’m getting this error on my site:
{“code”:”internal_server_error”,”message”:”
There has been a critical error on this website.<\/p>

Learn more about troubleshooting WordPress.<\/a><\/p>”,”data”:{“status”:500},”additional_errors”:[]}

I need your help in fixing this bug.
I reset the website and transferred a theme from my localhost.

I did this by allinonemigration plugin by exceeding the theme by code provided by this guy:

After this I’m getting this error.

Any help is appreciated!
Thanks!

The page I need help with: [log in to see the link]