No Server Updater after upgrading FC4 to FC5 and reinstalling Plesk 8.1

[fgossart]

ERROR: PleskFatalException
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AutoInstallerManager::getAutoInstaller() failed: AutoInstallerManager::_autoInstallerCall() failed: autoinstaller failed: Empty error message from utility.

0: /usr/local/psa/admin/plib/common_func.php3:153
psaerror(string 'AutoInstallerManager::getAutoInstaller() failed: AutoInstallerManager::_autoInstallerCall() failed: autoinstaller failed: Empty error message from utility.')
1: /usr/local/psa/admin/htdocs/server/autoinstaller_releases.php:25