[import theme results in server 500 error]

Hi Traumflug, How do I get the fix to my installation?

[import theme results in server 500 error]

Trying to import theme results in server 500 error, what to do?

 * @param string $themeDir
1462:     * @param bool   $sandbox
1463:     * @param bool   $redirect
1464:     *
1465:     * @return bool
1466:     *
1467:     * @throws PrestaShopDatabaseException
1468:     * @throws PrestaShopException
1469:     * @since 1.0.0
1470:     */
1471:    protected function installTheme($themeDir, $sandbox = false, $redirect = true)
1472:    {
1473:        if ($this->tabAccess['add'] && $this->tabAccess['delete'] && !_PS_MODE_DEMO_) {
1474:            $targetDir = _PS_ALL_THEMES_DIR_.$themeDir;
1475:
1476:            if ($sandbox) {
1477:                // Load configuration of the theme package.
1478:                $sandboxDir = $sandbox.'/'.$themeDir;
1479:                $xml = Theme::loadDefaultConfig($sandboxDir);
1480:                $xmlAttributes = $xml->attributes();
1481:                $targetDir = _PS_ALL_THEMES_DIR_.$xmlAttributes['directory'];
1482:
1483:                // Copy files of the theme its self.
1484:                if (file_exists($targetDir)) {
1485:                    $this->errors[] = sprintf(
1486:                        $this->l('Theme wants to install into %s, but this directory exists already.'),
1487:                        $targetDir
1488:                    );
1489:                } else {
1490:                    rename(