Bug 45083 - An error occured on client Build420703 while executing a reply for topic xvs/Build/
Summary: An error occured on client Build420703 while executing a reply for topic xvs/...
Alias: None
Product: Visual Studio Extensions
Classification: Xamarin
Component: XMA ()
Version: 4.2.0 (C8)
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2016-10-05 20:34 UTC by Mikael Nensén
Modified: 2017-06-15 20:51 UTC (History)
10 users (show)

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

The project (7.17 MB, application/x-zip-compressed)
2016-10-06 06:11 UTC, Mikael Nensén

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Description Mikael Nensén 2016-10-05 20:34:35 UTC
Just opened up a project that I hadn't touched since before summer. I've updated Xamarin on the Mac and on my PC (Visual Studio Extension). Tried to build, but instantly get the following:

An error occured on client Build420703 while executing a reply for topic xvs/Build/

Diagnostic output gives me the following:

C:\Program Files (x86)\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(1028,3): warning : An error occured on the receiver while executing a post for topic xvs/Build/ and client build2444cybro
1>C:\Program Files (x86)\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(1028,3): warning : An error occured on client Build420703 while executing a reply for topic xvs/Build/
1>C:\Program Files (x86)\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(1028,3): warning :    at Xamarin.Messaging.Client.MessagingClient.<PostAsync>d__23`2.MoveNext() in c:\Users\builder\data\lanes\3822\3b7df6f5\source\xamarinvs\src\Messaging\Xamarin.Messaging.Client\MessagingClient.cs:line 178
1>C:\Program Files (x86)\MSBuild\Xamarin\iOS\Xamarin.iOS.Common.targets(1028,3): error : An error occured on client Build420703 while executing a reply for topic xvs/Build/

A new/empty cross platform (shared) project builds without any issue.
Comment 1 Mikael Nensén 2016-10-05 20:35:37 UTC
Btw, why haven't you fixed the template for shared cross platform, it's still missing the Ad-Hoc and AppStore build configurations.
Comment 2 Mikael Nensén 2016-10-06 06:11:29 UTC
Created attachment 17897 [details]
The project

The stripped out iOS part of the project.
Comment 3 NMackay 2016-10-12 16:50:34 UTC
Oh joys, getting the same thing.

Severity	Code	Description	Project	File	Line	Suppression State
Error		An error occured on client Build420703 while executing a reply for topic xvs/Build/	PositionFinder.iOS			

Cross platform PCL (not shared)

Xamarin (3b7df6f)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android (96c7ba6)
Visual Studio extension to enable development for Xamarin.Android.

Xamarin.iOS (ad1cd42)
Visual Studio extension to enable development for Xamarin.iOS.

iOS BUild host: EL Capitan 10.66.6, latest xcode.
Comment 4 Chaitanya Gadi 2016-10-14 03:29:27 UTC
I am also facing the same issue.
Rebuild failure because of this error.I updated the new version of iOS and xamarin in visual studio on 11th oct and it worked for all these 3 days, but now it's an error.

An error occured on client Build420703 while executing a reply for topic xvs/Build/
Comment 5 antony.rey 2016-10-20 13:17:39 UTC

Same issue here, everything was building properly yesterday, and today when i opened back my project, impossible for me to build with the same error message.

Comment 6 Emanuel 2016-10-20 19:41:21 UTC
Hi all, thanks for reporting!

I was able to reproduce this issue using the attached solution and found out the build is failing because there are references to a LaunchImage in the csproj, but the referenced files are missing. 

We need to understand why those files are missing to be sure that’s not being caused by a bug:
-Did you try to delete the LaunchImage using the Assets editor? 
-Are you using a source control and those files were never added there? 
-Did you manually deleted those files?

To check which Asset file is missing you could check the XMA Build Agent log.

In the other hand, we will work to improve the error message thrown in Visual Studio.

Comment 7 Mikael Nensén 2016-10-21 07:08:57 UTC
I don't remember touching those files, but I can definitely say that I didn't touch them between the project building, updating Xamarin and then getting the build error.
Comment 8 antony.rey 2016-10-21 07:24:23 UTC
Hi all,

on my side the issue was related to a missing Assets.xcassets file : 

- i made a branch of my project in TFS, however i discovered that Assets.xcassets files are not added automatically to source control, you need to do it manually through Team Source Explorer.

However watching at the log files never gave me a clue on what was the issue, i just had this generic error with no detail at all...

Thanks, have a nice day !
Comment 9 NMackay 2016-10-28 14:02:48 UTC

Thanks for the pointers.

When you branch the solution in TFS (2012) It added this item group that previously didn't exist.

    <ImageAsset Include="Resources\ImageAssets.xcassets\AppIcons.appiconset\Contents.json">
    <ImageAsset Include="Resources\ImageAssets.xcassets\LaunchImages.launchimage\Contents.json">
    <ImageAsset Include="Resources\logoMark.xcassets\AppIcons.appiconset\Contents.json">
    <ImageAsset Include="Resources\logoMark.xcassets\LaunchImages.launchimage\Contents.json">

Removing it from the branched solution allows compiling again.
Comment 10 Adrian Alonso 2016-12-22 18:38:39 UTC
@cybrosys: could you please confirm if you're still able to reproduce the issue or if the any of the above ideas/solutions works for you too? Thanks, Adrian
Comment 11 mag@xamarin.com 2017-06-15 20:51:14 UTC
We have added several improvements around xcassets from the time the bug has been reported.
Given that we didn't get more information or feedback about it, we are closing this bug  as Resolved.
If you’re still facing this issue with current 15.3 Xamarin bits, please feel free to reopen the bug.