Warning: Undefined array key "page" in /customers/7/c/b/thepingpage.com/httpd.www/wp-content/plugins/gigs-calendar/gigs-calendar.php on line 875

Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method dtc_gigs::init() cannot be called statically in /customers/7/c/b/thepingpage.com/httpd.www/wp-includes/class-wp-hook.php:307
Stack trace:
#0 /customers/7/c/b/thepingpage.com/httpd.www/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#1 /customers/7/c/b/thepingpage.com/httpd.www/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#2 /customers/7/c/b/thepingpage.com/httpd.www/wp-settings.php(450): do_action('plugins_loaded')
#3 /customers/7/c/b/thepingpage.com/httpd.www/wp-config.php(77): require_once('/customers/7/c/...')
#4 /customers/7/c/b/thepingpage.com/httpd.www/wp-load.php(50): require_once('/customers/7/c/...')
#5 /customers/7/c/b/thepingpage.com/httpd.www/wp-blog-header.php(13): require_once('/customers/7/c/...')
#6 /customers/7/c/b/thepingpage.com/httpd.www/index.php(17): require('/customers/7/c/...')
#7 {main}
  thrown in /customers/7/c/b/thepingpage.com/httpd.www/wp-includes/class-wp-hook.php on line 307