Bug 55077 - NSInvalidArgumentException *** -[NSURL initFileURLWithPath:]: nil string parameter
Summary: NSInvalidArgumentException *** -[NSURL initFileURLWithPath:]: nil string para...
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: unspecified
Hardware: PC Windows
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2017-04-12 12:09 UTC by SiemensS23
Modified: 2017-07-25 14:20 UTC (History)
6 users (show)

Is this bug a regression?: ---
Last known good build:

Debug Console (3.59 KB, text/plain)
2017-04-12 12:09 UTC, SiemensS23

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Description SiemensS23 2017-04-12 12:09:42 UTC
Created attachment 21458 [details]
Debug Console

Hello everyone, i'm trying to develop a project with Xamarin Forms, specially Ios shared code where, after i binded the Google Vr SDK library perfect with ApDefinition & StructAndEnums classes and the GVRSDK static library, i ve some problem to solve.
When i insert the GVRVideoView widget into my ViewController, two buttons about Fullscreen and Cardboard View Mode doesn't appear; i've insert their own enable methods into code to do that.
Also when i tap them the app crashes and the debug console give me these exception. I don't know what i should try to do.
Maybe anyone can help and discuss with me these problem?
Comment 1 Paul DiPietro [MSFT] 2017-04-12 14:21:18 UTC
There's no explicit mention of Forms in your debug output, and in any case we would need more information in order to look into this further. Please upload a reproduction project with the minimal amount of code needed to reproduce the issue. 

That said, due to the sort of exception, I'm guessing it isn't a Forms issue and lies somewhere in code because presumably an nil parameter is being provided, which isn't allowed. I won't re-categorize the issue just yet, but please see if the answer provided here relating to that error is of any assistance to you (the code is in Objective-C but the general idea should be there): http://stackoverflow.com/questions/22551038/nsinvalidargumentexception-reason-nsurl-initfileurlwithpath-nil-st
Comment 2 SiemensS23 2017-04-12 15:07:05 UTC
Ok the code that i use about my project with the class references about it is these. Consider that shared code doesn't create any storyboard reference to work with that and so i coded that in one only class like these.

using CoreGraphics;
using Foundation;
using Google.VR;
using System;
using UIKit;

namespace App18.iOS
    public partial class ViewController : UIViewController, IGVRVideoViewDelegate

        GVRVideoView videoView = new GVRVideoView();
        //GVRPanoramaView videoView = new GVRPanoramaView();
        public bool IsPaused

        public ViewController(IntPtr handle) : base(handle)

        public ViewController()

        public override void ViewDidLoad()

            View.BackgroundColor = UIColor.White;

            CGRect rect = View.Bounds;
            CGRect Frame = new CGRect(20, 100, 280, 365);
            videoView.Frame = Frame;
            videoView.Delegate = this;
            videoView.LoadFromUrl(NSUrl.FromFilename("video.mp4"), GVRVideoType.StereoOverUnder);
            //videoView.DisplayMode = GVRWidgetDisplayMode.Fullscreen;
            var heightC = NSLayoutConstraint.Create(videoView, NSLayoutAttribute.Height, NSLayoutRelation.Equal,
                                                null, NSLayoutAttribute.NoAttribute, 1.0f, 50.0f);
            var widthC = NSLayoutConstraint.Create(videoView, NSLayoutAttribute.Width, NSLayoutRelation.Equal,
                                                null, NSLayoutAttribute.NoAttribute, 1.0f, 50.0f);
            var leftC = NSLayoutConstraint.Create(videoView, NSLayoutAttribute.Left, NSLayoutRelation.Equal,
                                                View, NSLayoutAttribute.Left, 1.0f, 100.0f);
            var rightC = NSLayoutConstraint.Create(videoView, NSLayoutAttribute.Right, NSLayoutRelation.Equal,
                                                View, NSLayoutAttribute.Right, 1.0f, 100.0f);
            var topC = NSLayoutConstraint.Create(videoView, NSLayoutAttribute.Top, NSLayoutRelation.Equal,
                                                View, NSLayoutAttribute.Top, 1.0f, 100.0f);
            //videoView.DisplayMode = GVRWidgetDisplayMode.Fullscreen;
        public void DidUpdatePosition(GVRVideoView videoView, double position)
            if (position == videoView.Duration)

        public void WidgetViewDidTap(GVRWidgetView widgetView)
            //throw new NotImplementedException();
            //videoView.DisplayMode = GVRWidgetDisplayMode.Fullscreen;

        public void WidgetView(GVRWidgetView widgetView, GVRWidgetDisplayMode displayMode)
            //throw new NotImplementedException();

        public void WidgetView(GVRWidgetView widgetView, NSObject content)
            //videoView = widgetView as GVRVideoView;
            videoView.EnableInfoButton = true;
            //videoView.EnableFullscreenButton = false;
            //videoView.EnableCardboardButton = false;
            videoView.EnableTouchTracking = true;


Comment 3 SiemensS23 2017-04-12 15:21:43 UTC
Oh i've comment also the two methods about the fullscreeen and cardboard button, i know. But when they enabled first of all they don't show up to the screen. Second, when i tap one of them, application will crash
Comment 4 Paul DiPietro [MSFT] 2017-06-19 18:26:56 UTC
Reassigning to X.iOS for upkeep as they might know more about this because I'm assuming it isn't a Forms issue.

(X.iOS team: Sorry in advance if this is in the wrong place and doesn't fall on you. Could be a fault with the GVR library?)
Comment 5 Rolf Bjarne Kvinge [MSFT] 2017-06-20 11:01:42 UTC
Please provide a complete solution we can use to reproduce this, since it may very well be an issue with either your bindings or the native library.
Comment 6 John Miller [MSFT] 2017-07-25 14:20:01 UTC
Because we have not received a reply to our request for more information, we are marking this issue as RESOLVED→NORESPONSE. If you are still encountering this issue on the latest Xamarin.iOS, please don’t hesitate to reopen the ticket with the requested information. Thanks!