Description
I have install Magento2 for second time I have same problem. Less don't work with exception:
[2015-01-28 16:18:51] main.CRITICAL: exception 'LogicException' with message 'magento_import returns empty result by path css/source/extend.less' in /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/Less/File/Collector/Aggregated.php:78 Stack trace: #0 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/Less/PreProcessor/Instruction/MagentoImport.php(97): Magento\Framework\Less\File\Collector\Aggregated->getFiles(Object(Magento\Core\Model\Theme), 'css/source/exte...') #1 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/Less/PreProcessor/Instruction/MagentoImport.php(78): Magento\Framework\Less\PreProcessor\Instruction\MagentoImport->replace(Array, Object(Magento\Framework\View\Asset\File)) #2 [internal function]: Magento\Framework\Less\PreProcessor\Instruction\MagentoImport->Magento\Framework\Less\PreProcessor\Instruction{closure}(Array) #3 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/Less/PreProcessor/Instruction/MagentoImport.php(80): preg_replace_callback('#//@magento_imp...', Object(Closure), '/**\n * Copyrigh...') #4 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/Less/FileGenerator.php(96): Magento\Framework\Less\PreProcessor\Instruction\MagentoImport->process(Object(Magento\Framework\View\Asset\PreProcessor\Chain)) #5 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/Css/PreProcessor/Less.php(41): Magento\Framework\Less\FileGenerator->generateLessFileTree(Object(Magento\Framework\View\Asset\PreProcessor\Chain)) #6 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/View/Asset/Source.php(147): Magento\Framework\Css\PreProcessor\Less->process(Object(Magento\Framework\View\Asset\PreProcessor\Chain)) #7 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/View/Asset/Source.php(90): Magento\Framework\View\Asset\Source->preProcess(Object(Magento\Framework\View\Asset\File)) #8 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/View/Asset/File.php(109): Magento\Framework\View\Asset\Source->getFile(Object(Magento\Framework\View\Asset\File)) #9 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/App/StaticResource.php(106): Magento\Framework\View\Asset\File->getSourceFile() #10 /opt/lampp/htdocs/magento2/lib/internal/Magento/Framework/App/Bootstrap.php(245): Magento\Framework\App\StaticResource->launch() #11 /opt/lampp/htdocs/magento2/pub/static.php(13): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\StaticResource)) #12 {main} [] []