Error: Unknown username. Check again or try your email address.

I used the extension above because It was loading and not displaying import button. After I installed manually it displays now but when you try to import, it returns this error message “Error: Unknown username. Check again or try your email address.”

I have done it as explained above but when importing, I get the error you can. check from screenshot. https://ibb.co/HXkTLVj