How to fix assembly security error in Unity 4.6

Question

I am getting an error when trying to use Facebook Unity SDK:

Could not securely load assembly from https://integrated-plugin-canvas-rsrc.fbsbx.com/rsrc/unity/lib/sdk_4.0/CanvasFacebook.dll UnityEngine.Debug:LogError(Object) FbDebug:Error(String) c__Iterator3:MoveNext() (at Assets/Ultimate GUI Kit/Facebook/Scripts/FB.cs:337)

I am aware that usually you just add if unity 4.6 to the FB.cs. However in the template I started with this class doesn't have this line. So how can i fix it? Here is definition of RemoteFacebookLoader class from my FB.cs file:

public abstract class RemoteFacebookLoader: MonoBehaviour {
    public delegate void LoadedDllCallback(IFacebook fb);

    private const string facebookNamespace = "Facebook.";

    private const int maxRetryLoadCount = 3;
    private static int retryLoadCount = 0;

    public static IEnumerator LoadFacebookClass(string className, LoadedDllCallback callback) {
#if UNITY_EDITOR || UNITY_WEBPLAYER
        var url = string.Format(IntegratedPluginCanvasLocation.DllUrl, className);
        var www = new WWW(url);
        FbDebug.Log("loading dll: " + url);
        yield
        return www;

        if (www.error != null) {
            FbDebug.Error(www.error);
            if (retryLoadCount < maxRetryLoadCount) {
                ++retryLoadCount;
#else 
                var www = new WWW("");
                yield
                return www;#endif#
                if UNITY_WEBPLAYER FBComponentFactory.AddComponent < CanvasFacebookLoader > ();#endif#
                if UNITY_EDITOR || UNITY_WEBPLAYER
            }
            www.Dispose();
            yield
            break;
        }

        var assembly = Security.LoadAndVerifyAssembly(www.bytes, );
        if (assembly == null) {
            FbDebug.Error("Could not securely load assembly from " + url);
            www.Dispose();
            yield
            break;
        }

        var facebookClass = assembly.GetType(facebookNamespace + className);
        if (facebookClass == null) {
            FbDebug.Error(className + " not found in assembly!");
            www.Dispose();
            yield
            break;
        }

        // load the Facebook component into the gameobject
        // using the "as" cast so it'll null if it fails to cast, instead of exception
        var fb = typeof(FBComponentFactory)
            .GetMethod("GetComponent")
            .MakeGenericMethod(facebookClass)
            .Invoke(null, new object[] {
            IfNotExist.AddNew
        }) as IFacebook;

        if (fb == null) {
            FbDebug.Error(className + " couldn't be created.");
            www.Dispose();
            yield
            break;
        }

        callback(fb);
        www.Dispose();

#endif
    }

    protected abstract string className {
        get;
    }

    IEnumerator Start() {
        var loader = LoadFacebookClass(className, OnDllLoaded);
        while (loader.MoveNext()) {
            yield
            return loader.Current;
        }
        Destroy(this);
    }

    private void OnDllLoaded(IFacebook fb) {
        FB.facebook = fb;
        FB.OnDllLoaded();
    }
}

Update

Looks like I was using old Facebook SDK (v4.0). So I updated FB.cs file and now I am getting another errors. They say something about OGACTIONTYPE and that unity can't load this type from IFacebook assembly. Check out screenshot of unity console.

Actually it says:

Assets/Ultimate GUI Kit/Facebook/Scripts/FB.cs(212,13): error CS0246: The type or namespace name `OGActionType' could not be found. Are you missing a using directive or an assembly reference?

Here is definition of RemoteFacebookLoader class from FB.cs file that I just loaded:

public abstract class RemoteFacebookLoader : MonoBehaviour
{
    public delegate void LoadedDllCallback(IFacebook fb);

    private const string facebookNamespace = "Facebook.";

    private const int maxRetryLoadCount = 3;
    private static int retryLoadCount = 0;

    public static IEnumerator LoadFacebookClass(string className, LoadedDllCallback callback)
    {
        var url = string.Format(IntegratedPluginCanvasLocation.DllUrl, className);
        var www = new WWW(url);
        FbDebug.Log("loading dll: " + url);
        yield return www;

        if (www.error != null)
        {
            FbDebug.Error(www.error);
            if (retryLoadCount < maxRetryLoadCount)
            {
                ++retryLoadCount;
#if UNITY_WEBPLAYER
                FBComponentFactory.AddComponent<CanvasFacebookLoader>();
#endif
            }
            www.Dispose();
            yield break;
        }

#if !UNITY_WINRT
#if UNITY_4_5 || UNITY_4_6 || UNITY_5_0
        var authTokenWww = new WWW(IntegratedPluginCanvasLocation.KeyUrl);
        yield return authTokenWww;
        if (authTokenWww.error != null)
        {
            FbDebug.Error("Cannot load from " + IntegratedPluginCanvasLocation.KeyUrl + ": " + authTokenWww.error);
            authTokenWww.Dispose();
            yield break;
        }
        var assembly = Security.LoadAndVerifyAssembly(www.bytes, authTokenWww.text);
#else
        var assembly = Security.LoadAndVerifyAssembly(www.bytes);
#endif
        if (assembly == null)
        {
            FbDebug.Error("Could not securely load assembly from " + url);
            www.Dispose();
            yield break;
        }

        var facebookClass = assembly.GetType(facebookNamespace + className);
        if (facebookClass == null)
        {
            FbDebug.Error(className + " not found in assembly!");
            www.Dispose();
            yield break;
        }

        // load the Facebook component into the gameobject
        // using the "as" cast so it'll null if it fails to cast, instead of exception
        var fb = typeof(FBComponentFactory)
                .GetMethod("GetComponent")
                .MakeGenericMethod(facebookClass)
                .Invoke(null, new object[] { IfNotExist.AddNew }) as IFacebook;

        if (fb == null)
        {
            FbDebug.Error(className + " couldn't be created.");
            www.Dispose();
            yield break;
        }

        callback(fb);
#endif
        www.Dispose();
    }

    protected abstract string className { get; }

    IEnumerator Start()
    {
        var loader = LoadFacebookClass(className, OnDllLoaded);
        while (loader.MoveNext())
        {
            yield return loader.Current;
        }
        Destroy(this);
    }

    private void OnDllLoaded(IFacebook fb)
    {
        FB.facebook = fb;
        FB.OnDllLoaded();
    }
}

d12frosted d12frosted · Accepted Answer · 2015-01-30T16:54:41

Looks like your FB.cs is outdated. For Unity 4.6 you should use on of the latest version of Facebook Unity SDk. You can download it on the official page.

Another possible problem - you modified this file. You should not do it unless you really know what are you doing.

Returning to your problem.

var assembly = Security.LoadAndVerifyAssembly(www.bytes,);
                                                       ^

This code is broken. What , symbol is doing after www.bytes?

Also for Unity 4.6 it should download unityhash file before it tries to load assembly. So actually this call should look like:

var assembly = Security.LoadAndVerifyAssembly(www.bytes, hashValue);

In my version of Unity SDK I have something like

#if UNITY_4_5 || UNITY_4_6 || UNITY_5_0
var authTokenWww = new WWW(IntegratedPluginCanvasLocation.KeyUrl);
yield return authTokenWww;
if (authTokenWww.error != null)
{
    Debug.LogError("Cannot load from " + IntegratedPluginCanvasLocation.KeyUrl + ": " + authTokenWww.error);
    authTokenWww.Dispose();
    yield break;
}
var assembly = Security.LoadAndVerifyAssembly(www.bytes, authTokenWww.text);
#else
var assembly = Security.LoadAndVerifyAssembly(www.bytes);
#endif

Update

After we discussed a problem a bit in chat we found the solution of existing problem. I am updating my question for those who might run in similar situation.

So to solve the problem OP did:

removed all files related to facebook unity sdk (I mean, all, not just FB.cs, but entire Facebook folder!)
download new version of sdk (it will be an unity asset package) and import it into the project
configure facebook plugin (like use proper app id from facebook app settings on facebook developers page)

How to fix assembly security error in Unity 4.6

1 Answers