server admin crash everytime

Dear members,

I hope somebody can help me with the problem which I have with Mac osX Lion Server.

The Server Admin programs doesn't start anymore like it should.

When I click on any (like dns/mail/ etc) I get an error message (pop-up):

"The service has encountered an error.

Try to refresh the view (mac-mini-van-m-temmink.local/DNS). (kReceivedUnkownError)."

At the same time I got an message in the console.app

21:46:40 ReportCrash: DebugSymbols was unable to start a spotlight query: spotlight is not responding or disabled.

21:46:41 com.apple.launchd: ( com.apple.servermgrd[2775] Job appears to have crashed: Trace/BPT trap: 5

21:46:42 ReportCrash: Saved Crash report for servermgrd[2775] version ??? (???) to /Library/Logs/DiagnosticReports/Servermgrd_2012-01-16-214642_localhost.crash

21:46:45 com.apple.launchd: (com.apple.servermgrd) Throttling respawn: Will start in 8 seconds.

21:49:02 sandboxd: ([2876]) xscertd(2876) deny job-creation

21:49:02 xscertd-helper: Starting xscertd-helper/1.0.0 (MacOS X Server)

21:49:02 sandboxd: ([2876]) xscertd-helper(2878) deny file-read-metadata /private/var/db/DetachedSignatures

21:49:02 sandboxd: ([2876]) xscertd-helper(2878) deny file-read-data /private/var/db/DetachedSignatures.

21:49:02 xscertd: Returning response with code 200 to (fe80:20e:c6ff:fef0:9ec2%en3]:50377

The application had worked correctly for a few weeks ago, but not anymore.

Who can help me fix this?