Unsupported: Hidden/TerrainEngine/Details/Vertexlit

Hey dear ! I am facing a severe problem regarding unity 3d. My unity is working fine and giving me no error but my build in iphone constantly crashing on debugging through xcode I have come to know about error which states

Unsupported: Hidden/TerrainEngine/Details/Vertexlit

I am very tense of this error…

I shall be very thankful to you if you can help me out

regards, Khawaja Salman

Hey friend
I really appreciate your answer
thanks