AP's are not managing with virtual controller?

[Prabhu_M1]

We have 3 No's of AP 7632 which is running the firmware version with 5.9.1.2-006R.
But AP's are not managing with Virtual Controller and also I executed the cmd slave AP in CLI such as AP7632#controller adoption host .

Kindly help us to resolve the issue.

[RobertZ]

Make sure that the VX9000 is on same firmware version as APs or vice versa.

Do you see them if you run CLI command 'show adoption status | i AP7632' ?