Unknown build error, 'Object reference not set to an instance of an object.'

[nightwolf13]

Environment data

dotnet --info output:
.NET Command Line Tools (2.1.103)

Product Information:
Version: 2.1.103
Commit SHA-1 hash: 60218cecb5

Runtime Environment:
OS Name: Windows
OS Version: 6.1.7601
OS Platform: Windows
RID: win7-x64
Base Path: C:\Program Files\dotnet\sdk\2.1.103\

Microsoft .NET Core Shared Framework Host

Version : 2.0.6
Build : 74b1c703813c8910df5b96f304b0f2b78cdf194d

VS Code version: 1.22.1
C# Extension version: 1.14.0

Steps to reproduce

Simply load project and tries to build.

Expected behavior

Project loaded and built

Actual behavior

Everytime i'm opening any project on my machine i got next warning in omnisharp log:
[warn]: OmniSharp.MSBuild.ProjectLoader
Unknown build error, 'Object reference not set to an instance of an object.'
c:\MyProjects\C#\UIInvestigations\UIInvestigations\UIInvestigations.csproj

I have visual studio 2015 installed on my machine also.. But don't have VS 2017.. When omnisharp is initialized there is also error about not found Microsoft.VisualStudio.Configuration.Native.dll.
When i trying to build my projects all WPF views has build error "InitializeComponent() not found".

[DustinCampbell]

This is something I've seen specifically with XAML-based projects. I believe the issue is due to some internal failure in the XAML markup compiler task when it tries to create a separate AppDomain to run the markup compiler within. I'll continue investigating to see if I can come up with a reasonable solution.

[hickford]

Some projects have trouble loading. Please review the output for more details.

OmniSharp.MSBuild.ProjectLoader
Unknown build error, 'Object reference not set to an instance of an object.'

I've also seen this error with xaml projects. Look forward to fix in next release.

[smitpatelx]

Error: IOException Cannot locate resource

Most of the time this error occur when using visual studio form applications.

To solve this error you can go to your App.xaml file and edit SratupUri to your current xaml form name.

<Application x:Class="AppName.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
    </Application.Resources>
</Application>