Hi,
Probably you deleted the Default Authorization Provider and therefor the user which starts the server (probably weblogic) can not be authenticated anymore.
Please look over the troubleshoot chapter from ASA bookself. It explain how to fix this which can be found under "Solve Configuration Problems ":
Symptom : WebLogic Server failed to start. Message in the WebLogic console says that "user weblogic failed to boot the server"
Possible Cause : You have configured the SiteMinder Authorization Provider incorrectly
Resolve problem:
If you have already configured the SiteMinder Authorization Provider:
1. Create a /* rule in the Authorization Provider realm.
2. Add this rule to the policy that contains all users of the user directory.
If you have not configured the SiteMinder Authorization Provider, verify that the group of user "weblogic" is being returned as "Administrators". You can configure groups to be returned by using SiteMinder responses.