undefined index error

Hi !

On a specific theme activation (smartit) i have those errors : Notice: Undefined index: solo-comment-subscribe in /wp-content/plugins/subscribe-to-double-opt-in-comments/subscribe-to-doi-comments.php(1036) : runtime-created function on line 1

Notice: Undefined index: salt in /wp-content/plugins/subscribe-to-double-opt-in-comments/subscribe-to-doi-comments.php on line 874

Notice: Undefined index: clear_both in /wp-content/plugins/subscribe-to-double-opt-in-comments/subscribe-to-doi-comments.php on line 880

Notice: Undefined index: default_subscribed in /wp-content/plugins/subscribe-to-double-opt-in-comments/subscribe-to-doi-comments.php on line 370

Notice: Undefined index: hideCopyright in /wp-content/plugins/subscribe-to-double-opt-in-comments/subscribe-to-doi-comments.php on line 371

When saving anything i get that in more :
Notice: Undefined index: solo-comment-subscribe in /wp-content/plugins/subscribe-to-double-opt-in-comments/subscribe-to-doi-comments.php(1036) : runtime-created function on line 1

Any way to solve that ?

Thanks !

http://wordpress.org/extend/plugins/subscribe-to-double-opt-in-comments/