Unknown Collection Error

RUSSBASS
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I have just started to see this error when it tries to collect from a pair of FAS3250s running 8.1.2:

Discovery:Error:Unknown Collection Error
Last Success:Today @ 10:30am
Last Attempt:Today @ 2:30pm
Illegal attempt to assign a primary resource key to null or unknown.

It was running fine before then.

Any thoughts?

Russ Bass