[TYPO3-english] Error after import...

[Din Bogdan]

Fatal error: Uncaught exception 'RuntimeException' with message 'Could not acquire lock for ClassLoader cache creation.' in C:\xampp\htdocs\typo3\sysext\core\Classes\Core\ClassLoader.php:738 Stack trace: #0 C:\xampp\htdocs\typo3\sysext\core\Classes\Core\ClassLoader.php(234): TYPO3\CMS\Core\Core\ClassLoader->acquireLock() #1 C:\xampp\htdocs\typo3\sysext\core\Classes\Core\ClassLoader.php(169): TYPO3\CMS\Core\Core\ClassLoader->buildCachedClassLoadingInformation('typo3_cms_core_...', 'TYPO3\\CMS\\Core\\...') #2 [internal function]: TYPO3\CMS\Core\Core\ClassLoader->loadClass('TYPO3\\CMS\\Core\\...') #3 C:\xampp\htdocs\typo3\sysext\core\Classes\Core\Bootstrap.php(308): spl_autoload_call('TYPO3\\CMS\\Core\\...') #4 C:\xampp\htdocs\typo3\sysext\core\Classes\Core\Bootstrap.php(232): TYPO3\CMS\Core\Core\Bootstrap->initializePackageManagement('TYPO3\\CMS\\Core\\...') #5 C:\xampp\htdocs\typo3\init.php(48): TYPO3\CMS\Core\Core\Bootstrap->loadConfigurationAndInitialize() #6 C:\xampp\htdocs\typo3\index.php(21): require('C:\\xampp\\htdoc in C:\xampp\htdocs\typo3\sysext\core\Classes\Core\ClassLoader.php on line 738