Cannot enable module

When i try to enable the modul the browser will not load the site - in both IE and Firefox

Ie writes - websit cannot be shown - error http 500

Firefox write - Error 503 Service Unavailable
Service Unavailable
Guru Meditation:
XID: 1864127442

I tried only "Rules" - NOT "Rules Scheduler" and not "Rules UI"

And i tried all 3 but the same result.

I also tried "rules-7.x-2.2" and the same result

And i have enabled - Entity API + Entity tokens 7.x-1.0-rc3

How can this be fixed