What you posted is for high availability. To change the AP hostname, that would be directly on the AP general tab when you click on the AP from the wireless tab.
The error message is telling you that on your High Availability tab you have an IP Address in the Primary/Secondary/Tertiary section but do not have a WLC hostname there. High Availability is done by WLC Name with the IP Address Optional. The only way you'll be able to make a GUI modification (change the AP name for example) will be AFTER you fix the error [remove the ip address in the HA section, or add the WLC name like is required for a valid HA config).
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