This is Magento bug. Wrong paths to Windows are generated. The fixed fix is

**Magento 2.3.0**


    #/vendor/magento/framework/View/Element/Template/File/Validator.php:114
the string

> `$realPath = $this->fileDriver->getRealPath($path);`
 

    to replace

> `$realPath = str_replace('\\', '/', $this->fileDriver->getRealPath($path));`

**Magento 2.2.7**

    /vendor/magento/framework/View/Element/Template/File/Validator.php:113

code

    protected function isPathInDirectories($path, $directories)
    {
        if (!is_array($directories)) {
            $directories = (array)$directories;
        }
        foreach ($directories as $directory) {
            if (0 === strpos($this->fileDriver->getRealPath($path), $directory)) {
                return true;
            }
        }
        return false;
    }

to replace

    protected function isPathInDirectories($path, $directories)
        {
            $realPath = str_replace('\\', '/', $this->fileDriver->getRealPath($path));
            if (!is_array($directories)) {
                $directories = (array)$directories;
            }
            foreach ($directories as $directory) {
                if (0 === strpos($realPath, $directory)) {
                    return true;
                }
            }
            return false;
        }