Pro version WP 3.8.1 > cannot redeclare add_google_analytics

Hi. When I tried to activate Pro version I got error like this:
Fatal error: Cannot redeclare add_google_analytics() in /home/vitalbox/domains/repignite.com/public_html/wp-content/plugins/nl_signup/nl_signup.php on line 343

I’m using Google Analyticator plugin http://ww.wp.xz.cn/plugins/google-analyticator/ and when I disable it – Mailchimp is activated.
Any way to fix it ?

Thanks
Paul
repIGNITE.com Sales Contest Platform

https://ww.wp.xz.cn/plugins/readykommerce-multi-newsletter-signup-light/