.net-core-2.0 azure app service 502.5 error

Question

Getting a 502.5 error after CI deployment to azure app service.

When running dotnet {myproject}.dll on the debug console this is the error I get:

Unhandled Exception: System.IO.FileLoadException: Could not load file or assembly 'System.Diagnostics.DiagnosticSource, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildCommonServices(AggregateException& hostingStartupErrors) at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build() at My.IOEducation.Api.Program.Main(String[] args) in D:\home\site\repository\My.IOEducation.Api\Program.cs:line 11

Running dotnet --version returns 2.0.0

Anyone else run into this yet and any suggestions on how to resolve?

UPDATE: Here is the contents of the project file.

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <Folder Include="Models\Report\" />
    <Folder Include="wwwroot\" />
    <Folder Include="DataAccess\ExternalApis\" />
    <Folder Include="DataAccess\ExternalApis\Helpers\" />
    <Folder Include="Models\Dashboard\" />
    <Folder Include="Helpers\" />
    <Folder Include="DataAccess\Redis\" />
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.ResponseCompression" Version="2.0.0" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.0.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="2.0.0" />
    <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
    <PackageReference Include="PowerBI.NetStandard.Api" Version="1.0.0" />
    <PackageReference Include="Swashbuckle.AspNetCore" Version="1.0.0" />
    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUi" Version="1.0.0" />
    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="1.0.0" />
    <PackageReference Include="Swashbuckle.AspNetCore.Swagger" Version="1.0.0" />
    <PackageReference Include="Dapper" Version="1.50.2" />
    <PackageReference Include="StackExchange.Redis" Version="1.2.6" />
    <PackageReference Include="Microsoft.AspNetCore" Version="2.0.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.0.0" />
  </ItemGroup>
  <ItemGroup>
    <None Remove="DataAccess\.DS_Store" />
    <None Remove=".DS_Store" />
  </ItemGroup>
</Project>

Are you able to reproduce the problem locally at all? If so, can you reduce it to a minimal example? (I appreciate that if you can only reproduce it on Azure, that will make it very time consuming.) I've seen this problem before with System.Net.Http references... if you could include your project file, that would really help, even if you can't get to a minimal example. — Jon Skeet
I am not able to reproduce the issue locally. It builds and runs fine in VS locally. I have seen the issue with System.Net.Http as well but was able to make that one happen locally in a different project. I will update the question with the project file — ktice12

Charl Charl · Accepted Answer · 2017-08-16T19:37:27

I spoke to the aspnet IISIntegration team members and found my solution.

tldr: Empty out your wwwroot folder on kudu.

The issue relates to having old things leftover from previous 1.x deployments

Step 1:

Navigate to the Kudu Console (https://{yourapp}.scm.azurewebsites.net/)

Step 2:

Navigate to file structure

Step 3:

Delete wwwroot folder

(Note: navigate into the "site" directory)

(Note: there is a wwwroot folder within this wwwroot. You should delete the one that is in the "site" directory)

Step 4:

Add a new empty folder called wwwroot where you just deleted the previous one (within "site" directory)

(Note: my deployment failed when I didn't have the empty wwwroot folder in there)

Step 5: Redeploy your app and hopefully it works. Good luck

.net-core-2.0 azure app service 502.5 error

3 Answers