( ! ) Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "Allegro_Sync_Background_Importer" not found in /var/www/html/wordpress/wp-includes/class-wp-hook.php on line 324
( ! ) TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "Allegro_Sync_Background_Importer" not found in /var/www/html/wordpress/wp-includes/class-wp-hook.php on line 324
Call Stack
#	Time	Memory	Function	Location
1	0.1390	15884272	WPCode_Error->track_errors( $e = class TypeError { protected $message = 'call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "Allegro_Sync_Background_Importer" not found'; private string ${Error}string = ''; protected $code = 0; protected string $file = '/var/www/html/wordpress/wp-includes/class-wp-hook.php'; protected int $line = 324; private array ${Error}trace = [0 => [...], 1 => [...], 2 => [...], 3 => [...], 4 => [...], 5 => [...], 6 => [...]]; private ?Throwable ${Error}previous = NULL; public $xdebug_message = '<tr><th align=\'left\' bgcolor=\'#f57900\' colspan="5"><span style=\'background-color: #cc0000; color: #fce94f; font-size: x-large;\'>( ! )</span> TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "Allegro_Sync_Background_Importer" not found in /var/www/html/wordpress/wp-includes/class-wp-hook.php on line <i>324</i></th></tr>\n<tr><th align=\'left\' bgcolor=\'#e9b96e\' colspan=\'5\'>Call Stack</th></tr>\n<tr><th align=\'center\' bgcolor=\'#eeeeec\'>#</th><th align=\'' } )	.../class-wpcode-error.php:0
2	0.1390	15884648	WPCode_Error->call_previous_exception_handler( $e = class TypeError { protected $message = 'call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "Allegro_Sync_Background_Importer" not found'; private string ${Error}string = ''; protected $code = 0; protected string $file = '/var/www/html/wordpress/wp-includes/class-wp-hook.php'; protected int $line = 324; private array ${Error}trace = [0 => [...], 1 => [...], 2 => [...], 3 => [...], 4 => [...], 5 => [...], 6 => [...]]; private ?Throwable ${Error}previous = NULL; public $xdebug_message = '<tr><th align=\'left\' bgcolor=\'#f57900\' colspan="5"><span style=\'background-color: #cc0000; color: #fce94f; font-size: x-large;\'>( ! )</span> TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "Allegro_Sync_Background_Importer" not found in /var/www/html/wordpress/wp-includes/class-wp-hook.php on line <i>324</i></th></tr>\n<tr><th align=\'left\' bgcolor=\'#e9b96e\' colspan=\'5\'>Call Stack</th></tr>\n<tr><th align=\'center\' bgcolor=\'#eeeeec\'>#</th><th align=\'' } )	.../class-wpcode-error.php:318