Assessment is failing

I have had a collection running for a number of weeks and it has stopped on the scheduled day.

I have noticed that the collect performance data field is incomplete.

The error: Your performance data haas not completed assessment.

When I try to manually run an assessment it fail

Please could some one shed any insight as to how to complete the asseesment.

I can not destroy this data and restart.

Also my log file is 3gb, is this normal?