Understanding an error message.

Hello, I'm getting an error message every time I hit play. It still allows me to run my game but I'd like to fix it.

Error Message : Actor::updateMassFromShapes: Compute mesh inertia tensor failed for one of the actor's mesh shapes! Please change mesh geometry or supply a tensor manually!

any ideas would be great, Thanks

Found it @ link text

maybe I should've checked first huh!