Error in admin dashboard

Hello,
I am using Rankmath for the last one year almost! It was going quite nicely until today when I am encountering an error in my admin dashboard. I guess it all started after I was trying with AMP plugin. I enabled the standard option in the AMP plugin which caused some deletions. Then i enabled the ‘reader’mode and later on i deleted the plugin. After that I am seeing error message related to Rank math.Please check the screenshot below

Can you please help me to fix this error ?

site url – http://www.tradethetechnicals.com/blog
Thank you