This is pretty strange if you only have a single country code configured. Bridge (Mesh) mode APs are not allowed to join multi-country controllers, and that should be the only reason for this specific error message...
Could you grab the output of a "show country channels" from your WLC?
Also, if the AP is in bridge/mesh mode, you will need to add the AP mac address to the WLC filter/ap policy to allow it to join as well.
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