call_user_func_array() expects parameter 1 to be a valid callback

  • Resolved Kreeger

    (@kreeger)


    9 years, 12 months ago

    Hello,

    It seems there is a little problem with the last update: I get 20 messages like this one when I save the plugin settings:

    Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'boolval' not found or invalid function name in /var/www/vhosts/max/httpdocs/wordpress_test/dev/wp-includes/plugin.php on line 235

    And finally at the end:

    Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/max/httpdocs/wordpress_test/dev/wp-includes/plugin.php:235) in /var/www/vhosts/max/httpdocs/wordpress_test/dev/wp-includes/pluggable.php on line 1171

    NB: I use only Ewww Image Optimize on my current dev website

    https://ww.wp.xz.cn/plugins/ewww-image-optimizer/

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