Mac Os X 10.8.2 Using Unity 3.5.6f4 Always Throws ArgumentException:length

I Have a Mac Mini, Use Os X 10.8.2 System, Install the Uinty 3 Version 3.5.6f4,
Import a Project, Always have
[ArgumentException:length System.Array.Copy(System.Array sourceArray, Int32 sourceIndex, System.Array destinationArray, Int32 length)

how can i fix that. thanks!

I also meet this problem :Mac mini Os X 10.9.2 ,Unity3 4.3.4,I don’t know where produce this problem,How fix it