Random.Range gives "Unknown resolve error"

Question

public int num;

void Start () {

    num = Random.Range (1, 5);

}

When I do this, the word Random gets colored red, and it just says:

"unknown resolve error".

Any ideas?

Possible duplicate of [How do I generate a random int number in C#?](http://stackoverflow.com/questions/2706500/how-do-i-generate-a-random-int-number-in-c) — Lews Therin, Oct 16 '15 at 20:32
Do you have `using System;` at the top of your code? the full name of `Random` is `System.Random`. — Tamir Vered, Oct 16 '15 at 20:35
yeah I have these: using UnityEngine; using System.Collections; using System; using UnityEngine.UI; using System.IO; using System.Threading; — zligg, Oct 16 '15 at 20:36
@TamirVered `Random` in this case is not the `System` one, but the Unity one. — Ron Beyer, Oct 16 '15 at 20:38
Yeah I get the error: `Random' is an ambiguous reference between `UnityEngine.Random' and `System.Random'. Any idea what I should do? — zligg, Oct 16 '15 at 20:42

score 5 · Answer 1 · answered Oct 16 '15 at 20:44

5

Add the following code at the top of your code

using Random = UnityEngine.Random;

Random.Range is not part of System.Random, it's a Unity function

answered Oct 16 '15 at 20:44

Hamix

This is correct answer, if one has both `using System;` and `using UnityEngine;` the compiler cannot know which Random is meant if one just types `Random`. – wlfbck Jun 14 '17 at 10:30

Tamir Vered · Answer 2 · 2015-10-16T20:46:17.027

First, make sure your script isn't named the same as unity's libraries and classes.

Since you use unity Random not System.Random, try typing the following code instead:

num = UnityEngine.Random.Range(1, 5)

You might be able to remove the UnityEngine. if you have the following statement at the top of your code:

using UnityEngine;

If you want only the Random class or want to resolve an Ambiguous reference you can use:

using Random = UnityEngine.Random;

Also if you use C#'s System.Random you can use Random.Next instead.

2 Answers2