What does MissingManifestResourceException mean and how to fix it?

user_33225 0
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The situation:

  • I have a class library, called RT.Servers, containing a few resources (of type byte[], but I don't think that's important)
  • The same class library contains a method which returns one of those resources
  • I have a simple program (with a reference to that library) that only calls that single method

I get a MissingManifestResourceException with the following message:

Could not find any resources appropriate for the specified culture or the neutral culture. Make sure "Servers.Resources.resources" was correctly embedded or linked into assembly "RT.Servers" at compile time, or that all the satellite assemblies required are loadable and fully signed.

I have never played around with cultures, or with assembly signing, so I don't know what's going on here. Also, this works in another project which uses the same library. Any ideas?

culture resources manifest .net c#
26 Answers

Recently stumbled upon this issue, in my case I did a few things:

  1. Make sure the namespaces are consistent in the Designer.cs file of the resx file

  2. Make sure the default namespace of the Assembly(right click the project and choose Properties) is set the same to the namespace the resources file is in.

Once I did step 2, the exception went away.

user_91914950

I had this problem when I added another class in the file just before the class which derived from Form. Adding it after fixed the problem.

user_13681840

Also the same error may occur when you put a new class into the source code of a designer created form's class.

This new class may be removed, and placed in a different cs file.

(At least in my case this was the problem...)

user_115156930

In my case, I have a web api with resources and I create a nuget package from that. When I use this nuget in other projects, I realise that when I request a api with resources, I am getting MissingManifestResourceException after a bit reasearch, I learn nuget packager is not packing resources automatically. If you want to use resources files, you have to do that manually. So you need to add below lines to your .nuspec file: (Visit https://github.com/NuGet/Home/issues/1482)

<package> 
    <metadata>
    </metadata>
    <files>
        <file src="bin\Debug\en\MyAssembly.resource.dll" target="lib\net40\en\MyAssembly.resource.dll" />
        <file src="bin\Debug\es\MyAssembly.resource.dll" target="lib\net40\es\MyAssembly.resource.dll" />
    </files>
</package>

But, before adding files, you need to be sure which version of .net you are using.

user_80746140

I had the with a newly created F# project. The solution was to uncheck "Use standard resource names" in the project properties -> Application -> Resources / Specify how application resources will be managed. If you do not see the checkbox then update your Visual Studio! I have 15.6.7 installed. In 15.3.2 this checkbox is not there.

user_13865310

Just to mention. If you use a constant or literal, make sure it refers to a resource of the form ProjectName.Resources, and does not cpntain Resources.resx.

It could save you an hour or two .

Admin1

I've encountered this issue with managed C++ project based on WinForms after renaming global namespace (not manually, but with Rename tool of VS2017).

The solution is simple, but isn't mentioned elsewhere.

You have to change RootNamespace entry in vcxproj-file to match the C++ namespace.

user_5361720

In my case it was a typo in the Xaml of a window opened from Winforms Form:

Incorrect: <Image Source="/Resources/WorkGreen.gif"/>

Correct: <Image Source="../Resources/WorkGreen.gif"/> It may help someone

user_65323100

In my case I have changed my project namespace and hence my solution was throwing "missingmanifestresourceexception" exception.

Instead of right clicking the .resx file in the solution explorer and clicking on "Run Custom Tool" option, I have replaced the rootnamespace to new namespace in .csproj file(RootNamespace) and rebuilded the solution again.

All Resources.Designer.cs files namespaces got automatically changed with new namespace.

I hope my answer will help someone.

user_79252200

If you're getting this while generating a C# project using CMake, the solution I found may help you.

Your CMakeLists.txt file needs

set_property(TARGET yourTargetName PROPERTY VS_GLOBAL_RootNamespace yourRootNamespace)

Substitute your own values for yourTargetName and yourRootNamespace, obviously.

Then the resources will get embedded in your assembly!

user_6038280

One more reason to get this error is- '.resx' file excluded from project.

In my case, '.resx' file was excluded from project.

  1. Select 'show all files' option in solution explorer.
  2. Right click on '.resx' file(s) and click include in project.

Rebuild the project/solution.

user_77572560

I read all the answers and nothing worked for me. Most likely my situation is different, but same error. My issue was that I had two projects. Second project had a lot of forms added to it from the first one as "Add as link".

For WinForms, there are 3 required files: the code, the designer, and the resource files. If you add all 3 files at the same time as "Add as link", Visual Studio does not link them together as same form. It will compile, and run, but it will blow up with the same MissingManifestResourceException error.

Fix: You have to do them individually, in order: code file --> designer file --> resource file. Then they are grouped and no more error, at least for me.

user_20629750
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