AP authentication on WLC2006

Hello,

I just purchased Cisco wireless system with WLC2006 (software ver.

The WLC sees the AP, but it has problem communicating with it. This is the log:

Controller:

Sun Sep 3 21:49:51 2006 [ERROR] spam_lrad.c 2544: Security processing of Image Data failed from AP 00:17:59:67:76:80 Sun Sep 3 21:49:51 2006 [ERROR] spam_crypto.c 653: Failed decryption of message from AP 00:17:59:67:76:80

On the AP I get:

I do not have service account to download the latest WLC software (4.0.15...), and the AP's can not be downgraded to authonomus. Any ideas ?

Thanks, Vasil