Error Redirection Plugin

Hello,

I’m using the Redirection Plugin https://wordpress.org/plugins/redirection/ and get there the following error message:

Unexpected token < in JSON at position 0 (SyntaxError)

WordPress returned an unexpected message. This is probably a PHP error from another plugin.

Possible cause: </script> <!– / WP SEO Structured Data Plugin. –> </body> </html>

Can you please let me know, how to fix this?

Thx
Sally