Unable to extract CSS
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Tried to run extract CSS for a page and got below error.
FastCGI sent in stderr: “PHP message: PHP Fatal error: Uncaught Error: Call to undefined function mb_convert_encoding() in /var/www/wp-content/plugins/above-the-fold-optimization/includes/optimization.class.php:252
Stack trace:
#0 [internal function]: Abovethefold_Optimization->end_cssextract_buffering(‘<!DOCTYPE html>…’, 9)
#1 /var/www/wp-includes/functions.php(3464): ob_end_flush()
#2 /var/www/wp-includes/plugin.php(525): wp_ob_end_flush_all(”)
#3 /var/www/wp-includes/load.php(635): do_action(‘shutdown’)
#4 [internal function]: shutdown_action_hook()
#5 {main}
thrown in /var/www/wp-content/plugins/above-the-fold-optimization/includes/optimization.class.php on line 252
PHP message: PHP Warning: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference, value given in Unknown on line 0″
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