Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method GA_Filter::spool_adsense() cannot be called statically in /var/www/html/ucompare/wp-includes/class-wp-hook.php:308
Stack trace:
#0 /var/www/html/ucompare/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters()
#1 /var/www/html/ucompare/wp-includes/plugin.php(517): WP_Hook->do_action()
#2 /var/www/html/ucompare/wp-includes/general-template.php(3049): do_action()
#3 /var/www/html/ucompare/wp-content/themes/twentyten/header.php(51): wp_head()
#4 /var/www/html/ucompare/wp-includes/template.php(783): require_once('...')
#5 /var/www/html/ucompare/wp-includes/template.php(718): load_template()
#6 /var/www/html/ucompare/wp-includes/general-template.php(48): locate_template()
#7 /var/www/html/ucompare/wp-content/themes/twentyten/page.php(15): get_header()
#8 /var/www/html/ucompare/wp-includes/template-loader.php(106): include('...')
#9 /var/www/html/ucompare/wp-blog-header.php(19): require_once('...')
#10 /var/www/html/ucompare/index.php(17): require('...')
#11 {main}
thrown in /var/www/html/ucompare/wp-includes/class-wp-hook.php on line 308