Error while activating Rank Math

I was using Yoast SEO and want to use Rank Math on my Website merahomechef.com . However, there is some error which is causing trouble while activating this plugin.
Error states: There has been a critical error on your website. Please check your site admin email inbox for instructions.

Learn more about debugging in WordPress.

I had already read one of the tickets solution wherein you asked to follow few steps like check updates and php and everything to which i have no drawback in the provided conditions. Please help.