failed to join controller ap cisco 1231

[Abdelkebir1]

I have a  2504 controller and I am trying to add a 1200 series AP . 

The controller has version 7.2.120 version and the AP was just converted from autonomous to lwapp by tftpd32.

Here is what the AP is showing when it is booting up and fails to join.

*Apr 13 16:48:04.012: %CAPWAP-3-ERRORLOG: Go join a capwap controller
*Apr 13 16:48:04.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 10.10.1.1 peer_port: 5246
*Apr 13 16:48:04.001: %CAPWAP-5-CHANGED: CAPWAP changed state to
*Apr 13 16:48:05.715: %DTLS-5-ALERT: Received FATAL : Certificate unknown alert from 10.10.1.1
*Apr 13 16:48:05.715: %CAPWAP-3-ERRORLOG: Bad certificate alert received from peer.
*Apr 13 16:48:05.715: %DTLS-5-PEER_DISCONNECT: Peer 192.168.1.3 has closed connection.
*Apr 13 16:48:05.716: %DTLS-5-SEND_ALERT: Send WARNING : Close notify Alert to 10.10.1.1:5246
*Apr 13 16:48:05.717: %CAPWAP-3-ERRORLOG: Invalid event 38 & state 3 combination.

please step by step solution and thank's

[Bob Bagheri]

Here is a previous Cisco community thread that may help:

Did you use the Cisco Aironet to LWAPP conversion tool.

if Yes.

Check the directory where the upgrade tool is installed and see if it created a file (.csv) that contains the SSC for the AP. Then manually add that into the WLC under Security and then AP policies link.

[Abdelkebir1]

please can you explaine to how to use lwapp conversion tool and where can i find file .csv .