Fatal error: Uncaught Error: Call to undefined function W3TC\getmypid() in /www/wp-content/plugins/w3-total-cache/Cache_File_Generic.php:69
Stack trace:
#0 /www/wp-content/plugins/w3-total-cache/PgCache_ContentGrabber.php(2435): W3TC\Cache_File_Generic->set('townlinehatcher...', Array, 3600, '')
#1 /www/wp-content/plugins/w3-total-cache/PgCache_ContentGrabber.php(549): W3TC\PgCache_ContentGrabber->_maybe_save_cached_result('\nDeprecated: st...', Array, false)
#2 [internal function]: W3TC\PgCache_ContentGrabber->ob_callback('\nDeprecated: st...')
#3 /www/wp-content/plugins/w3-total-cache/Util_Bus.php(39): call_user_func(Array, '\nDeprecated: st...')
#4 /www/wp-content/plugins/w3-total-cache/Generic_Plugin.php(999): W3TC\Util_Bus::do_ob_callbacks(Array, '\nDeprecated: st...')
#5 /www/wp-content/plugins/w3-total-cache/Generic_Plugin.php(1112): W3TC\Generic_Plugin->ob_callback('\nDeprecated: st...')
#6 /wordpress/wp-includes/class-wp-hook.php(341): W3TC\Generic_Plugin->ob_shutdown('')
#7 /wordpress/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters('', Array)
#8 /wordpress/wp-includes/plugin.php(522): WP_Hook->do_action(Array)
#9 /wordpress/wp-includes/load.php(1308): do_action('shutdown')
#10 [internal function]: shutdown_action_hook()
#11 {main}
  thrown in /www/wp-content/plugins/w3-total-cache/Cache_File_Generic.php on line 69