IGUI IOS error

Hello every one , i facing an error blocks my project , i have a project works fine on IOS ans Android , next i faced some resolution problems so i tried to use IGUI plug-in it works fine on editor and when i build to Android it works exactly as i want but when i send the project for my friend to build it to IOS (on his mac because i don't have mac) it show him this erros :

!-Error building Player: UnityExceptionross compilation failed

!-cross compilation job igui.dll failed

this is the screen shot

Please help me i cans move on .thanks