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warning on activation

  • Hi im an absolute beginner and trying to build my first website so sorry if this is a simple thing.. ive just installed the plugin and this appeared…..

    Warning: Cannot modify header information – headers already sent by (output started at /home/u12expl/public_html/wp-admin/includes/template.php:1642) in /home/u12expl/public_html/wp-includes/pluggable.php on line 876

    what do i need to do?
    many thanks in advance 🙂


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