At least one AP is upgrading image, download cannot start

Trying to perform a code upgrade on our WLC but receive this error -
At least one AP is upgrading image, download cannot start
I don't see any of the AP's in the download state either viewing through the GUI or CLI.
Has anyone run into this before ? Any suggestions ?

Issue has been reported on some 7.4 and 7.6 codes where the controller will prevent rebooting
thinking one (some) of the AP's is in downloading state even when there are no AP's that show stuck in this process.
To fix this, I had to do a forced reboot on the controller using the command “reset system forced”.
Our controllers are in HA mode so I than forced a fail-over back to the primary.
Once completed I was able to upgrade the controllers.

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