No website – no access to WordPress – don't know what forum to post on

this is what i see when i try to connect to wordpress

Fatal error: Cannot redeclare bp_dtheme_ajax_querystring() (previously declared in /hermes/bosweb/web149/b1490/nf.graduationinsurancec/public_html/wp-content/themes/bp-scholar/_inc/ajax.php:17) in /hermes/bosweb/web149/b1490/nf.graduationinsurancec/public_html/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/ajax.php on line 81

i waited all day for my web host to help and they said “Hello,

I have checked the issue with your website and it seems like there is an issue with the plugin that you have installed. Hence I suggest you to contact the vendor of the application regarding the issue.”