What will happen if I bump the USB drive Ubuntu is running from?

Question

I installed Visual Studio for Mac - Community and followed the Xamarin.iOS tutorial from the Xamarin site. When I select Main.storyboard I get an exception - Am I doing something wrong?:

My installation info: === Visual Studio Community 2017 for Mac ===

Version 7.2.2 (build 7) Installation UUID: adfed099-1ec0-45d3-b154-d4ce3ffe4bd3 Runtime: Mono 5.4.1.6 (2017-06/1f4613aa1ac) (64-bit) GTK+ 2.24.23 (Raleigh theme)

Package version: 504010006

=== NuGet ===

Version: 4.3.1.4445

=== .NET Core ===

Runtime: /usr/local/share/dotnet/dotnet Runtime Version: 2.0.0 SDK: /usr/local/share/dotnet/sdk/2.0.0/Sdks SDK Version: 2.0.0 MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/5.4.1/lib/mono/msbuild/15.0/bin/Sdks

=== Xamarin.Profiler ===

Version: 1.5.6 Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Xamarin.Android ===

Version: 8.0.2.1 (Visual Studio Community) Android SDK: /Users/daniel/Library/Android/sdk Supported Android versions: 6.0 (API level 23) 7.1 (API level 25)

SDK Tools Version: 25.2.5 SDK Platform Tools Version: 25.0.5 SDK Build Tools Version: 25.0.3

Java SDK: /usr java version "1.8.0_131" Java(TM) SE Runtime Environment (build 1.8.0_131-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

Android Designer EPL code available here: https://github.com/xamarin/AndroidDesigner.EPL

=== Xamarin Inspector ===

Version: 1.3.2 Hash: 461f09a Branch: 1.3-release Build date: Tue, 03 Oct 2017 18:26:57 GMT Client compatibility: 1

=== Apple Developer Tools ===

Xcode 9.1 (13532) Build 9B55

=== Xamarin.iOS ===

Version: 11.2.1.0 (Visual Studio Community) Hash: 12e80e01 Branch: d15-4-xi Build date: 2017-10-13 12:03:42-0400

=== Xamarin.Mac ===

Version: 3.8.1.0 (Visual Studio Community)

=== Build Information ===

Release ID: 702020007 Git revision: 2236098c68f51eeb447cb947a87371d1e84f6213 Build date: 2017-10-23 11:43:05-04 Xamarin addins: eaa605cf97f25ce184949f32c712b465ca96f665 Build lane: monodevelop-lion-d15-4

=== Operating System ===

Mac OS X 10.12.6 Darwin 16.7.0 Darwin Kernel Version 16.7.0 Thu Jun 15 17:36:27 PDT 2017 root:xnu-3789.70.16~2/RELEASE_X86_64 x86_64

The Exception: System.NotSupportedException: Could not parse xml ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NullReferenceException: Object reference not set to an instance of an object at MonoTouch.Design.Client.IPhoneDesignerSession.GetCurrentXcodeVersion () [0x00000] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/IPhoneDesignerSession.cs:851 at MonoTouch.Design.Client.IPhoneDesignerSession.get_XcodeVersion () [0x00000] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/IPhoneDesignerSession.cs:160 at MonoTouch.Design.IModelObjectContextExtensions.WithIdProvider (MonoTouch.Design.IModelObjectContext context, MonoTouch.Design.IIdProvider idProvider) [0x0000b] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/IModelObjectContextExtensions.cs:10 at MonoTouch.Design.Parser.ParseElementsAndAttributes (MonoTouch.Design.ParseContext context, System.Object result) [0x0003d] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:278 at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context, System.Object result, Xamarin.Designer.ProxiedException error) [0x000d0] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:370 at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context) [0x00041] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:245 at MonoTouch.Design.Parser.ParseElement (MonoTouch.Design.LayoutGuides layoutGuides, MonoTouch.Design.ParseContext context) [0x0000f] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:1019 at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305 --- End of inner exception stack trace --- at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00043] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:313 at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229 at MonoTouch.Design.Parser.ParseElements (MonoTouch.Design.ParseContext context, System.Object result) [0x000da] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:324 at MonoTouch.Design.Parser.ParseElementsAndAttributes (MonoTouch.Design.ParseContext context, System.Object result) [0x0002d] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:274 at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context, System.Object result, Xamarin.Designer.ProxiedException error) [0x000d0] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:370 at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context) [0x00041] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:245 at MonoTouch.Design.Parser.ParseElement (MonoTouch.Design.ProxiedViewController model, MonoTouch.Design.ParseContext context) [0x000f3] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:751 at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305 --- End of inner exception stack trace --- at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00043] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:313 at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229 at MonoTouch.Design.Parser.ParseElements (MonoTouch.Design.ParseContext context, System.Object result) [0x000da] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:324 at MonoTouch.Design.Parser.ParseElementsAndAttributes (MonoTouch.Design.ParseContext context, System.Object result) [0x0002d] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:274 at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context, System.Object result, Xamarin.Designer.ProxiedException error) [0x000d0] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:370 at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context) [0x00041] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:245 at MonoTouch.Design.Parser.ParseElement (MonoTouch.Design.Scene scene, MonoTouch.Design.ParseContext context) [0x0008b] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:689 at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305 --- End of inner exception stack trace --- at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00043] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:313 at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/referencesource/mscorlib/system/reflection/methodbase.cs:229 at MonoTouch.Design.Parser.ParseElements (MonoTouch.Design.ParseContext context, System.Object result) [0x000da] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:324 at MonoTouch.Design.Parser.ParseElementsAndAttributes (MonoTouch.Design.ParseContext context, System.Object result) [0x0002d] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:274 at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context, System.Object result, Xamarin.Designer.ProxiedException error) [0x000d0] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:370 at MonoTouch.Design.Parser.ParseCore (MonoTouch.Design.ParseContext context) [0x00041] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:245 at MonoTouch.Design.Parser.ParseElement (MonoTouch.Design.Storyboard sb, MonoTouch.Design.ParseContext context) [0x00040] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:884 at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) at System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00032] in /Users/builder/data/lanes/4992/mono-mac-sdk/external/bockbuild/builds/mono-x64/mcs/class/corlib/System.Reflection/MonoMethod.cs:305 --- End of inner exception stack trace --- at MonoTouch.Design.Parser.Parse (MonoTouch.Design.ParseContext context, System.Boolean skipImageGeneration) [0x00021] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:225 at MonoTouch.Design.Parser.Parse (MonoTouch.Design.ParseContext context) [0x00000] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:214 at MonoTouch.Design.Parser.Parse (System.Xml.Linq.XElement xml, MonoTouch.Design.DeviceFamily targetRuntime, MonoTouch.Design.IModelObjectContext modelObjectContext) [0x00014] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Shared/Parser.cs:203 at MonoTouch.Design.Client.IPhoneDesignerSession+d__163.MoveNext () [0x00130] in /Users/builder/data/lanes/5144/2236098c/source/md-addins/Xamarin.Designer.iOS/MonoTouch.Design.Client/IPhoneDesignerSession.cs:412

Contents of /Users/daniel/Library/Logs/VisualStudio/7.0/iOSDesigner.2017-11-03__22-14-31.log: MDAddinsHash: eaa605cf97f25ce184949f32c712b465ca96f665

Any clues?

Solution 1

It would be the same as removing your hard drive while your computer is on, most likely it will cause a crash that may not be recoverable from unless you reinstall.

Here is one example

I will add that this has happened to me and I had to reformat the flash drive and reinstall.

Solution 2

That has happened to me before. I installed Ubuntu on a usb hard disk so I wouldn't have to wipe my windows installation off this computer. However, since it is a laptop, I often use it on the couch. So, one day I ended up accidentally unplugging the disk when I had to run for the phone. What happened was not a bluescreen-like crash as I expected. Instead, some weird things happened to the os. All the programs I had open stayed open in memory, although all of them began throwing errors whenever they tried to access storage. Unity also bugged up badly and eventually crashed. I wonder if a tool could be created that runs in memory and throws a system killswitch if this happens to me again. Either that or actually re-mounting the drive, if possible.

Comments

[Admin]

Exactly the same that will happen if you unplug your main hard disk while running on it. It can happen everything, from a simple crash to a completely unusable file system.

[Admin]

I am really looking for personal experience with Ubuntu. I have read posts on SuperUser all over on the theoretical side of things.

[Admin]

Try it, it's not so difficult at all. Mind you, there are USB bootable distribution that copy all the needed thing in RAM and free the USB disk, but the one I know are quite old. A normal linux use the disk as page cache at least for executables, libraries, and a lot of things; remove the disk and a crash is guarantee. The disk can be corrupted or not, depending on the moment, the luck and the phase of the moon.

[SushiHangover]

If you right-click on the storyboard and choose Xcode Interface Builder does the storyboard open ok?

[Daniel]

Yes, that does open it in XCode.

[Robbie Wxyz]

The supplied link doesn't seem to have to do with multi-boot. It looks like he was formatting the drive when he removed it (which obviously destroys all data). Am I missing the connection?

[Wild Man]

This is the connection "Oops, I accidentally unplugged my USB hard drive, now I can't access it"., it really does not matter what you are doing when your device gets unplugged it is all bad.

[Lukas]

@WildMan Not quite the same. When formatting, the file table of the FS gets wiped as well, so even if some data is still on the drive, you don't know where to look for it. (Special case: Some fast formatting tools will ONLY wipe the file table so all data is still there after formatting). Open files being written to will be malicious, some files maybe lost, your system will prob. crash. I had several power outages on different OSes and it didn't destroy all of my data.

[Daniel]

I was on XCode 9.0 when I installed VS and got the error. I then upgraded to 9.1. I am not pulling in Xibs I am creating new in VS

[JKapsi]

Try to switch to beta channel.

[Daniel]

Sorry, not sure what that means?

[JKapsi]

Click on visual studio menu (upper left corner) and then check for updates. Switch to beta channel and download the newer beta version. Check if the problem persist

[Daniel]

Aha, you mean I should use the beta preview version?

[Daniel]

Yes that did the trick, update your answer so I can mark it as the solution!

[Daniel]

I have been struggling on XCode to use auto-layout to make an app I'm trying to build scale across all form factors iphone/ipad and in desperation is now trying Xamarin and will try to build for iOS and Andriod. Is there a good tutorial on doing layout that works/scales correctly - it's not a simple layout? I know this is not the place to ask, but any direction will be appreciated.

[JKapsi]

Check for adding and removing variations in constraints and ui elements