How can I solve the error - Fatal error: Cannot redeclare idn_to_ascii() in C:\xampp\htdocs\idna\wp-content\plugins\idna\idna_wp.php on line 73?

Question

I just installed IDNA plugin of WordPress. Was about to test WordPress for internationalised domain names and got this error. My WordPress version is 5.6 and the version of IDNA