Hi Raheel,
this error occurred during the upgrade. The previous installed version of junos was 10.1r1.8.
I had to to upgrade the srx with the no-validate command. After a reboot my configuration wasn't loaded because of the missing wlan statement. I had to add this statement to my configuration and reboot the srx again. Now the srx bootet successfully with 10.1r2.8.
When i now delete the wlan statement from my configuration again, everything is working fine.
I'm missing something or is this just a error in the 10.1r2.8 image?
Thank you for your help.