ERROR MESSAGE TOP OF ALL PAGES WITH NEWSLETTER SIGNUP

  • Strict Standards: call_user_func_array() expects parameter 1 to be a valid callback, non-static method MultiColorSubscribeWidget::addcss() should not be called statically in /home/websdn/public_html/b***/wp-includes/plugin.php on line 496

    I get this error at the top of all my pages with newsletter signup.
    I haven’t altered the plugin at all.

    Any ideas?

    bellabug.websitedevelopmentnashville.com

    https://www.ads-software.com/plugins/newsletter-sign-up/

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