Step 1: Have the ward clerk check for long class names (>40 characters). We had an issue reported today where a long class name was causing problems. We're working on an MLS update to address that. MLS should be patched shortly to handle these.
Step 2: After fixing long class names, if necessary, try a unit data refresh and then transmit a half dozen times, waiting a few minutes between each transmission. If the problem persists, you'll need to contact the Global Service Center.
There are some situations where updates from LCR are not transmitted to MLS or MLS can't reconcile class assignment or calling data. When MLS detects one of these situations, it requests a refresh to resolve the issue. That message indicates that MLS has tried several times to resolve one of these situations and hasn't been able to reconcile the discrepancies. It's basically the equivalent of "I can't figure it out, so you'd better get someone to look at it."
The second step (refresh and transmit several times to see if the error is gone) runs it through a full cycle of attempts.