Bad Server Response

[grupoboheme]

Hello I need help, my EspoCRM stopped working, now I can't login and all I get is a "Bad Server Response" error message, first I thought it was the PHP version so I asked my provider to downgrade it to 7.3 but still same error, please any one? Help of ideas?

This is my domain: https://www.grupoboheme.com/espo/

And error log