Hi Babek,
If you are completely sure the LDAP configuration if fine and you have a valid dsquery from the server looks like you have a credentials issue:
Simple authentication for administrator returned code (49) Invalid credentials
This is a pretty good guide that you can follow to make sure everything is properly configured:
http://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/98625-asa-ldap-authentication.html
Hope this info helps!!
Rate if helps you!!
-JP-