Publish assets bug

[b1rdex]

2018/03/27 17:28:04 [error] [php] mkdir(): File exists (/www/versions/806.15/vendor/yiisoft/yii/framework/utils/CFileHelper.php:363)
Stack trace:
#0 /www/versions/806.15/vendor/yiisoft/yii/framework/web/CAssetManager.php(250): copyDirectory()
#1 /www/versions/806.15/protected/extensions/yii-bootstrap/components/Bootstrap.php(306): CAssetManager->publish()
#2 /www/versions/806.15/protected/extensions/yii-bootstrap/components/Bootstrap.php(50): Bootstrap->getAssetsUrl()
#3 /www/versions/806.15/protected/extensions/yii-bootstrap/components/Bootstrap.php(81): Bootstrap->registerCoreCss()
#4 /www/versions/806.15/protected/extensions/yii-bootstrap/components/Bootstrap.php(115): Bootstrap->registerAllCss()
#5 /www/versions/806.15/protected/themes/default/views/layouts/main.php(46): Bootstrap->register()