My game crashes when loading an AssetBundle that contains a scene

Symptoms

• There is a crash when you try to load an AssetBundle that contains a scene. This error appears: "InvalidOperationException: This method cannot be used on a streamed scene AssetBundle.at UnityEngine.AssetBundle.LoadAllAssets (System.Type type) [0x00000] in <filename unknown>:0"

Cause

In Unity 5.3.4p5, it is possible to call LoadAllAssets to load scenes if the AssetBundle is a scene bundle. If you upgrade to 5.3.5p5 however, it will crash or show an error.

Resolution

It is not necessary to call LoadAllAssets when you load scenes from AssetBundles.

You can check if a bundle is a streamed scene using AssetBundle.isStreamedSceneAssetBundle and avoid to use LoadAllAssets when the AssetBundle contains an scene.

www = new WWW( urlServer + bundleName);

yield return www;

AssetBundle bundle = www.assetBundle;

if ( bundle.isStreamedSceneAssetBundle)

{

SceneManager.LoadSceneAsync( sceneName , LoadSceneMode.Additive  );
}

More Information

This article is for Unity version 5.3.5p5.

https://docs.unity3d.com/Manual/AssetBundlesIntro.html

https://unity3d.com/learn/tutorials/topics/best-practices/guide-assetbundles-and-resources