I've never seen that error message first hand, however if the switch is booted and everything is running on the new code, I wouldn't worry too much about it. Just monitor the device and make sure nothing is out of the ordinary.
Hi Andre, It looks like this is fixed in 16.2.2, 126.96.36.199-patch1-2, and 22.1 (per xos0063769). It seems to be harmless and is a result of an incorrect read of an install status field. As Jeremy suggested, since everything seems to be running fine on the new code, there doesn't seem to be a need to worry about it.