Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method OWA_Block::register_widget_sidebar() cannot be called statically in /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-includes/class-wp-hook.php:292
Stack trace:
#0 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters('', Array)
#1 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#2 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-includes/widgets.php(1799): do_action('widgets_init')
#3 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-includes/class-wp-hook.php(292): wp_widgets_init('')
#4 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array)
#5 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-includes/plugin.php(484): WP_Hook->do_action(Array)
#6 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-settings.php(560): do_action('init')
#7 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-config.php(81): require_once('/homepages/45/d...')
#8 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-load.php(37): require_once('/homepages/45/d...')
#9 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-blog-header.php(13): require_once('/homepages/45/d...')
#10 /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/index.php(17): require('/homepages/45/d...')
#11 {main}
thrown in /homepages/45/d192788311/htdocs/clickandbuilds/PaulMaguire/wp-includes/class-wp-hook.php on line 292