Warning: require(C:\xampp\htdocs\mmmotors\vendor\symfony\polyfill-php56\bootstrap.php): failed to open stream: Invalid argument in C:\xampp\htdocs\mmmotors\vendor\composer\autoload_real.php on line 70

Fatal error: require(): Failed opening required 'C:\xampp\htdocs\mmmotors\vendor\composer/../symfony/polyfill-php56/bootstrap.php' (include_path='C:\xampp\htdocs\mmmotors\vendor/magento/zendframework1/library;C:\xampp\php\PEAR') in C:\xampp\htdocs\mmmotors\vendor\composer\autoload_real.php on line 70