Unity project wont build

Hi all, i have a very basic project that ive put together, just to see how it all works. unfortunately it will not build for mac or windows. the game loads but then errors out with this message.

Scene::raycastClosestShape: the maximum distance must be greater that zero!

but im not using rays? on windows it frame rate must be about 00.1 fps, on the mac its fine, the sound plays and my rev counter moves as it should but my cars are sat on the body colliders with no movement

heres the error i get from the editor when building.

conversionMap[platform].find ( inType ) != conversionMap[platform].end() UnityEditor.HostView:OnGUI()

it plays fine in the editor with no warnings

has any one come across this before?