Hi,
Fisrt of all what is the code of WLC 2500,paster the output of : sh sysinfo from wlc.
AIR-LAP1524SB
-A, C and N: 6.0 or later
All other reg. domains: 7.0.116.0 or later.
AIR-LAP1524PS
-A: 4.1.192.22M or 5.2 or later1
AP 1040 minimum software is 7.0.98.0
Reagrds
Your WLC software should be minimum ios 7.0.116.0.
Regards