ASDM error after changing privilege level from 2 to 15

[isk-admin]

After basic installation (local) with nat,some ACLs and ssh-access I changed in ASDM the privilege level from my username from level 2 to level 15.
The result is that I can´t load configuration with ASDM and the following error message appears:

ASDM did not get a response from the ASA in the last 60 seconds. Please check the configuration and your connection and then try again by clicking Refresh

What´s going wrong? SSH is working fine with this username.

[isk-admin]

SORRY: ASA 5505, Version 8.2(5), ASDM version 6.4(5)

Another problem occurs after configuring aaa authorization command LOCAL (see attachement)
So I tried ASDM version 6.4(7) but with the same result.