Warning: Uncaught Error: Call to undefined method Magento\Framework\Session\SaveHandler\Native::open() in C:\xampp\htdocs\vendor\magento\framework\Session\SaveHandler.php:72 Stack trace: #0 [internal function]: Magento\Framework\Session\SaveHandler->open('C:\\xampp\\tmp', 'PHPSESSID') #1 C:\xampp\htdocs\vendor\magento\framework\Session\SessionManager.php(189): session_start() #2 C:\xampp\htdocs\vendor\magento\framework\Interception\Interceptor.php(146): Magento\Framework\Session\SessionManager->start() #3 C:\xampp\htdocs\var\generation\Magento\Framework\Session\Generic\Interceptor.php(26): Magento\Framework\Session\Generic\Interceptor->___callPlugins('start', Array, Array) #4 C:\xampp\htdocs\vendor\magento\framework\Session\SessionManager.php(130): Magento\Framework\Session\Generic\Interceptor->start() #5 C:\xampp\htdocs\var\generation\Magento\Framework\Session\Generic\Interceptor.php(14): Magento\Framework\Session\SessionManager->__construct(Object(Magento\Framework\App\Request\Http), Object(Magento\Framework\Session in C:\xampp\htdocs\vendor\magento\framework\Session\SaveHandler.php on line 72

Fatal error: session_start(): Failed to initialize storage module: user (path: C:\xampp\tmp) in C:\xampp\htdocs\vendor\magento\framework\Session\SessionManager.php on line 189

Fatal error: Uncaught Exception: Warning: SessionHandler::close(): Parent session handler is not open in C:\xampp\htdocs\vendor\magento\framework\Session\SaveHandler.php on line 82 in C:\xampp\htdocs\vendor\magento\framework\App\ErrorHandler.php:61 Stack trace: #0 [internal function]: Magento\Framework\App\ErrorHandler->handler(2, 'SessionHandler:...', 'C:\\xampp\\htdocs...', 82, Array) #1 C:\xampp\htdocs\vendor\magento\framework\Session\SaveHandler.php(82): SessionHandler->close() #2 [internal function]: Magento\Framework\Session\SaveHandler->close() #3 {main} thrown in C:\xampp\htdocs\vendor\magento\framework\App\ErrorHandler.php on line 61