[SM5]Function MalLayerBlend_Standard Error

hi, my name is “Rayan” and i’m graphist junior for video game.
I am french and i little speak english.

To upgrade my skills in UDK4 , i build one map with advanced shaders and materials function.

In the last day, i am confronted with one error. Can you help plz? i can’t found what this node doesn’t work.

Thanks very much for your watching.