Cannot redeclare class Walker_Category_Checklist

  • Hello, when i installed the plugin, my website is dead.

    [18-Jul-2015 05:18:33 UTC] PHP Fatal error: Cannot redeclare class Walker_Category_Checklist in /home2/tinycode/public_html/domains/islamspedia.com/wp-admin/includes/template.php on line 129

    Using latest version of WP and WikiWP theme.

    What’s wrong please?

    https://www.ads-software.com/plugins/slickquiz/

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