i'm facing suddenly 'HTTP ERROR 500'

help me, i’m facing ‘HTTP ERROR 500’ whenever i try to login to my wordpress panel Log In ‹ PARWARISH – Nurturing Growth — WordPress

there is nothing showing on my website

& i’m also unable to do anything at cyberpanel end, whenever i try to make any change in cyberpanel it gets automatically logout…i can’t to anything

the same issue. I can not access control panel and CMS.