Getting TypeLoadException when starting ASP.Net Core App

Question

I have an ASP.Net Core App and when I try to start it, the following line throws a System.TypeLoadException:

    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(env.ContentRootPath)
            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);

        if (env.IsEnvironment("Development"))
        {
            // This will push telemetry data through Application Insights pipeline faster, allowing you to view results immediately.
            builder.AddApplicationInsightsSettings(developerMode: true);
        }

        builder.AddEnvironmentVariables();
        Configuration = builder.Build(); // <-- exception is thrown here
    }

The Exception reads:

Could not load type 'System.Runtime.Serialization.ISerializable' from assembly 'System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'.

This is what my project.json looks like:

{
  "dependencies": {
    "adremes.Common": "1.1.0",
    "adremes.Data": "1.1.2",
    "AutoMapper": "5.2.0",
    "Microsoft.AspNetCore.Hosting.Abstractions": "1.1.0",
    "Microsoft.AspNetCore.Routing": "1.1.0",
    "Microsoft.AspNetCore.Server.IISIntegration": "1.1.0",
    "Microsoft.AspNetCore.Server.Kestrel": "1.1.0",
    "Microsoft.AspNetCore.SignalR.Server": "0.2.0-preview2-22683",
    "Microsoft.AspNetCore.WebSockets": "1.1.0-preview1-23121",
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0",
    "Microsoft.Extensions.Configuration.FileExtensions": "1.1.0",
    "Microsoft.Extensions.Configuration.Json": "1.1.0",
    "Microsoft.Extensions.Logging": "1.1.0",
    "Microsoft.Extensions.Logging.Console": "1.1.0",
    "Microsoft.Extensions.Logging.Debug": "1.1.0",
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.1.0",
    "Microsoft.NETCore.App": "1.1.0",
    "AutoMapper.Collection": "2.1.2",
    "Microsoft.AspNetCore.Identity": "1.1.0",
    "DocumentFormat.OpenXml": "2.7.0-vnext0061",
    "AspNet.Security.OpenIdConnect.Server": "1.0.0-beta7-final",
    "AspNet.Security.OAuth.Validation": "1.0.0-alpha3-final",
    "Microsoft.ApplicationInsights.AspNetCore": "2.0.0",
    "Microsoft.AspNetCore.Mvc": "1.1.1"
  },

  "tools": {
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview4-final"
  },

  "frameworks": {
    "netcoreapp1.0": {
      "dependencies": {
        "adremes.Exchange.Common": {
          "target": "project"
        },
        "adremes.Exchange.Data": {
          "target": "project"
        },
        "adremes.Exchange.Services": {
          "target": "project"
        }
      },
      "imports": [
        "dnxcore50"
      ]
    }
  },
  "runtimes": {
    "win10-x64": {}
  },

  "buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true,
    "allowUnsafe": true
  },

  "runtimeOptions": {
    "configProperties": {
      "System.GC.Server": true
    }
  },

  "publishOptions": {
    "include": [
      "wwwroot",
      "**/*.cshtml",
      "appsettings.json",
      "web.config"
    ]
  },

  "scripts": {
    "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  }
}

The referenced projects are all netstandard1.5

I tried adding "System.Runtime.Serialization.Primitives": "4.3.0" to my dependencies without success.

Does anyone know what I have to do to successfully start my Project?

whats the target framework of the solution? 4.0 or higher. Try setting to 4.0 if higher. — Wheels73
– Wheels73, Commented Jan 30, 2017 at 8:51
The target is netcoreapp1.0; because I#m using ASP Core, I cannot set it to 4.0, 4.5, etc. — wertzui
– wertzui, Commented Jan 30, 2017 at 9:03
have you tried adding it in as a dependant assembly in config. <dependentAssembly> <assemblyIdentity name="System.Runtime.Serialization.Primitives publicKeyToken="7cec85d7bea7798e" culture="neutral" /> — Wheels73
– Wheels73, Commented Jan 30, 2017 at 9:06
This is .Net Core and does not have a .csproj to add a dependantAssembly. However as mentioned above I tried adding it to the project.json without success. — wertzui
– wertzui, Commented Jan 30, 2017 at 9:11
I'm unfamiliar with .Net Core sorry. Is there no "Web.config" either? That is where the config setting goes — Wheels73
– Wheels73, Commented Jan 30, 2017 at 9:14

wertzui · Accepted Answer · 2017-01-30 10:09:24Z

1

The problem is in the dependencies section of the project.json.

The line

"Microsoft.NETCore.App": "1.1.0",

should be

"Microsoft.NETCore.App": {
  "type": "platform",
  "version": "1.1.0"
},

Then this would generate an Error at startup (use "dotnet run" from a console to see the error message).

The error says that 1.1.0 of Microsoft.NETCore.App is missing.

Installing it from https://www.microsoft.com/net/download/core#/current then fixed the problem.

answered Jan 30, 2017 at 10:09

wertzui

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