ILMT Missed scan report

Even after executing the all ILMT fixlets successfully we are able to see 3 servers are showing “Missed scan”

when i check in the forum saying this problem might occur because the computer is out of space, is misconfigured, or the scan was stopped.

I am sure about misconfigured not happen and scan was not stopped.

can any one please explain what “computer is out of space” or else any other reason is there for showing missed scan for 3 servers.