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1200 AP CAPWAP errors connecting to a 4404 WLC

We recently updated to software release 6.0.188.0.  We now have one AP unbale to join.  When the AP attempts to join I am getting the following errors:

%CAPWAP-3-ERRORLOG: Go join a capwap controller
%CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 10.9.254.251 peer_port: 5246
%CAPWAP-5-CHANGED: CAPWAP changed state to
%CAPWAP-5-DTLSREQSUCC: DTLS connection created sucessfully peer_ip: 10.9.254.251 peer_port: 5246
%CAPWAP-3-ERRORLOG: Failed to get serial number.
%CAPWAP-3-ERRORLOG: WTP Board data: Failed to get serial number.
%CAPWAP-3-ERRORLOG: Join request: Failed to encode WTP Board Data message element.

%CAPWAP-3-ERRORLOG: Failed to encode Join request.
%CAPWAP-3-ERRORLOG: Failed to send Join request to 10.9.254.251
%DTLS-5-SEND_ALERT: Send WARNING : Close notify Alert to 10.9.254.251:5246

All other AP's join successfully.  This AP had no problems prior to the update.

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Re: 1200 AP CAPWAP errors connecting to a 4404 WLC

Only Cisco Aironet 1200 Series Access Points that contain 802.11g (AIR-MP21G) or second-generation 802.11a radios (AIR-RM21A or AIR-RM22A) are supported for use with controller software releases. The AIR-RM20A radio, which was included in early 1200 series access point models, is not supported. To see the type of radio module installed in your access point, enter this command on the access point: show controller dot11radio n, where n is the number of the radio (0 or 1).

Cisco Unified Wireless Network Solution Components
http://www.cisco.com/en/US/docs/wireless/controller/release/notes/crn6_0_188.html#wp233793

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