Audio Unit Validation Failure in Logic

Hi,

I'm running Locig Pro 7 but I'm having problems with one of my synths. When I open the AU Manager and run a scan it fails validation. The synth is Rob Papen Blue. In the result it says this:

Checkeing Parameter Setting
Using AudioUnitSetParameter
Using AudioUnitScheduleParameter
ERROR: Buffer overun was detected when rendering

FAIL


And then it says to correct the errors above. I have the same with another plug-in called OhmBoyz.

If anyone knows what to do, please let me know.

Thanks

Much appreciated.