Warning: Unsupported declare 'strict_types' in D:\xampp\htdocs\wsdemo\vendor\nikic\php-parser\lib\PhpParser\Lexer\Emulative.php on line 1

Fatal error: Class 'PhpParser\Lexer' not found in D:\xampp\htdocs\wsdemo\vendor\nikic\php-parser\lib\PhpParser\Lexer\Emulative.php on line 9