Fix WordPress Error

I’m looking for help to restore my WordPress website, which is currently displaying a critical error on the public-facing website and WordPress login. My hosting provider, Krystal, has investigated and identified an incompatibility with the Revolution Slider (revslider) plugin... (Budget: £20 - £250 GBP, Jobs: Content Management System (CMS), cPanel, Database Management, HTML, MySQL, PHP, Web Development, Web Hosting, Website Optimization, WordPress)