If the AP isn't even getting an IP Address, then that's a problem with your LAN / DHCP Server. Even if the options are wrong, it should still take the IP Address.
If you're getting an address, but the AP doesn't seem able to connect to the WLC, check that you've setup Options 43 & 60 correctly and then try again.
If you're getting a DHCP Lease and the AP contacts the WLC, but fails to provision its self, check the MTU between the AP & WLC. Hopefully its bigger than 500 bytes (the minimum threshold for LWAPP).
Also, has your AP been connected elsewhere before? It could be that it's remembered its settings from a previous installation? If so, reset the AP by holding the mode button down for 20 seconds, and then entering the command;
clear lwapp private-config
After which it should request DHCP (etc..) as normal. Failing that, you could configure the AP manually with the commands;
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
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