Warning: Unsupported declare 'strict_types' in D:\xampp\htdocs\prdk-wb-be\vendor\guzzlehttp\promises\src\TaskQueueInterface.php on line 3

Parse error: syntax error, unexpected ':', expecting ';' or '{' in D:\xampp\htdocs\prdk-wb-be\vendor\guzzlehttp\promises\src\TaskQueueInterface.php on line 12