PLEASE TELL ME WHAT IS WRONG HERE I RECIEVE THIS ERROR

public float num;

void Start ()
{
    num = Random.Range(1F, 2F);
}

ERROR IN VISUAL STUDIO: ‘GRASSAUDIO.Random()’ is a method, which is not valid in the given context

There seems to be a conflict with another namespace.

Try this:

num = UnityEngine.Random.Range(1F, 2F);