StoryBoard.InstantiateViewController giving "Unknown class testController in Interface Builder file"

Question

I am working on a Xamarin IOS/monotouch project. I have been stuck with this error since some time. These are the lines of code

var prfc = this.Storyboard.InstantiateViewController ("testController") as testController;
            if (prfc != null) {
                this.PresentViewController(prfc,false,null);}

I tried renaming viewcontroller, cleaning and building solution, deleting viewcontroller and adding a new one with another name I have ensured that all spellings are correct, i have same Viewcontroller name, StoryBoardID, and Restoration ID. This is how I have registered my viewcontroller in Designer partial class

[Register ("testController")]
partial class testController

Here is my appdelegate.cs code `[Register ("AppDelegate")] public partial class AppDelegate : UIApplicationDelegate { // class-level declarations UIWindow window; public static UIStoryboard Storyboard = UIStoryboard.FromName ("MainStoryboard", null); public static UIViewController initialViewController; public override UIWindow Window { get; set; }

`[Register ("AppDelegate")] public partial class AppDelegate : UIApplicationDelegate { // class-level declarations UIWindow window; public static UIStoryboard Storyboard = UIStoryboard.FromName ("MainStoryboard", null); public static UIViewController initialViewController; public override UIWindow Window { get; set; }
// This method is invoked when the application is about to move from active to inactive state.
// OpenGL applications should use this method to pause.
public override void OnResignActivation (UIApplication application)
{
}

// This method should be used to release shared resources and it should store the application state.
// If your application supports background exection this method is called instead of WillTerminate
// when the user quits.
public override void DidEnterBackground (UIApplication application)
{
}

// This method is called as part of the transiton from background to active state.
public override void WillEnterForeground (UIApplication application)
{
}

// This method is called when the application is about to terminate. Save data, if needed.
public override void WillTerminate (UIApplication application)
{
}
public override void FinishedLaunching (UIApplication application)
{
    window = new UIWindow (UIScreen.MainScreen.Bounds);

    initialViewController = Storyboard.InstantiateInitialViewController () as UIViewController;

    window.RootViewController = initialViewController;
    window.MakeKeyAndVisible ();
    return ;
}

}`

I have tried out every possibility but can't fix this. This error is occuring for every new viewcontroller that I add to Storyboard. I am getting a null when I call InstantiateViewController. I have tried cleaning and rebuilding. It works on simulator, but not on device

Possibly your simulator cache corrupted. Clean your project as described here: stackoverflow.com/questions/26206041/… — orkenstein
@orkenstein I have tried cleaning and rebuilding. Forgot to mention, it works on simulator, but not on device — Sreeraj
Ok, any differences between Simulator and Device target/schema? — orkenstein
@orkenstein Yeah. That was the issue. I was targeting ios 7.1 and now it works after bringing down it to 7.0. Thank You... — Sreeraj

Sreeraj Sreeraj · Accepted Answer · 2014-11-18T09:12:12

The issue was as pointed out by @orkenstein. I was targeting 7.1 whereas was testing on a 7.0 device

StoryBoard.InstantiateViewController giving "Unknown class testController in Interface Builder file"

1 Answers