ImageSharp.Web.Sample yields System.MissingMethodException on macOS

[fhintsch]

Prerequisites

Install ImageSharp.Web-master on a Mac. Start Visual Studio with ImageSharp.Web.sln

Description

Build ImageSharp.Web.Sample (see ticket #53 on errors).
Run it.
The demo page looks quite poor like this

All requests for an image result in an exception like:

Microsoft.AspNetCore.Hosting.Internal.WebHost:Information: Request starting HTTP/1.1 GET http://localhost:2646/imagesharp-logo.png?width=300&bgcolor=FFFF00 �[40m�[32minfo�[39m�[22m�[49m: Microsoft.AspNetCore.Hosting.Internal.WebHost[1] Request starting HTTP/1.1 GET http://localhost:2646/imagesharp-logo.png?width=300&bgcolor=FFFF00 Exception thrown: 'System.MissingMethodException' in SixLabors.ImageSharp.Web.dll Exception thrown: 'System.NotSupportedException' in SixLabors.ImageSharp.Web.dll Exception thrown: 'System.MissingMethodException' in System.Private.CoreLib.dll Microsoft.AspNetCore.Hosting.Internal.WebHost:Information: Request finished in 4214.771ms 500 text/html; charset=utf-8 �[40m�[32minfo�[39m�[22m�[49m: Microsoft.AspNetCore.Hosting.Internal.WebHost[2] Request finished in 4214.771ms 500 text/html; charset=utf-8 �[40m�[32minfo�[39m�[22m�[49m: Microsoft.AspNetCore.Hosting.Internal.WebHost[1] Request starting HTTP/1.1 GET http://localhost:2646/imagesharp-logo.png?width=300&bgcolor=128,28,32 Microsoft.AspNetCore.Hosting.Internal.WebHost:Information: Request starting HTTP/1.1 GET http://localhost:2646/imagesharp-logo.png?width=300&bgcolor=128,28,32 �[41m�[30mfail�[39m�[22m�[49m: Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1] An unhandled exception has occurred while executing the request. System.MissingMethodException: Method not found: 'Void Microsoft.Net.Http.Headers.EntityTagHeaderValue..ctor(System.String)'. at SixLabors.ImageSharp.Web.Middleware.ImageContext.ComputeLastModified() at SixLabors.ImageSharp.Web.Middleware.ImageContext.ComprehendRequestHeaders(DateTimeOffset lastModified, Int64 length) in .../ImageSharp.Web-master/src/ImageSharp.Web/Middleware/ImageContext.cs:line 103 at SixLabors.ImageSharp.Web.Middleware.ImageSharpMiddleware.SendResponse(ImageContext imageContext, String key, Stream stream, ImageMetaData metadata) in .../ImageSharp.Web-master/src/ImageSharp.Web/Middleware/ImageSharpMiddleware.cs:line 279 at SixLabors.ImageSharp.Web.Middleware.ImageSharpMiddleware.Invoke(HttpContext context) in .../ImageSharp.Web-master/src/ImageSharp.Web/Middleware/ImageSharpMiddleware.cs:line 203 at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context) Exception thrown: 'System.MissingMethodException' in SixLabors.ImageSharp.Web.dll Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware:Error: An unhandled exception has occurred while executing the request.

System Configuration

• ImageSharp.Web version: 1.0.0-beta6
• Other SixLabors packages and versions:
  packages/sixlabors.core/1.0.0-beta0006/lib/netcoreapp2.0/SixLabors.Core.dll packages/sixlabors.imagesharp/1.0.0-beta0005/lib/netcoreapp2.1/SixLabors.ImageSharp.dll
• Environment (Operating system, version and so on): macOS 10.14.2
• .NET Core version: 2.1.2
• Additional information: VS Community for Mac 7.7.3

[JimBobSquarePants]

Looking at your stacktrace it appears this is the issue.

domaindrivendev/Swashbuckle.AspNetCore#438

[fhintsch]

I examined this thread too. Adding an explicit reference doesn’t make it better. The kestrel output states "Loaded '/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App/2.1.2/Microsoft.AspNetCore.StaticFiles.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled."

[fhintsch]

Good news.

I did a complete new install of dotnet core 2.2 on linux and everything worked fine!

Then I did an uninstall of dotnet on the Mac (following https://stackoverflow.com/a/44089766/475997) and a new install of dotnet core 2.2.

Executing dotnet run in ImageSharp.Web.Sample and ... everything fine.

Thanks for your assistance, Jim!

[JimBobSquarePants]

Great news!