ERR_HTTP2_PROTOCOL_ERROR

Hi folks, I"m a newby on the websites edit. I"m having this issue with my wordpress. I cant edit the pages, I received an email with this information: Se ha producido un error del tipo E_COMPILE_ERROR en la l"nea 55 del archivo /home/f6v79i6bji0o/public_html/wp-content/themes/adforest/functions.php. Mensaje de error: require(): Failed opening required '/home/f6v79i6bji0o/public_html/wp-content/themes/adforest/css/colors/custom-theme-color.php' (include_path='.:/opt/alt/php73/usr/share/pear') Can anyone help me? Thanks