Cookies are blocked when logging in with LDAP credentials

Hi,

I’ve managed to install the plugin and set it up, but whenever I try to login using LDAP credentials, the login fails and the following error is displayed

ERROR: Cookies are blocked due to unexpected output.

Logging in with locally created accounts works without issue.

If you could please advise on how I can troubleshoot this error I would be grateful.

https://wordpress.org/plugins/simple-ldap-login/