This issue ended up being a result of having the wrong country codes configured on the controller. I had to add GB and RU to my country list to get the AP's to join the controller. What is the model of the AP? Mine was this: AIR-LAP1242AG-E-K9 so I had to go into the following on the controller:
wireless>Country and select the appropriate regulatory domains
Make sure your regulatory domains include the letter 'E' (or whatever your access point model is)
Also, you have to disable the 'A' and 'G' radios globally to change the country domains.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
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