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I have 12 wireless controllers added to Cisco Prime 1.3 only 2 of them have collection status of Managed. The other 10 all have Managed with Warnings. Please see inventory.log.] ERROR inventory - 10.29.20.1 Exception occured while inventory collec...
The issue was that the 5508 WLCs were running firmware 7.6.120.0 and that's not compatible with Cisco Prime Infrastructure 1.3. I had to upgrade to Cisco Prime Infrastructure 2.1 and that resolved my issues.