Collectives™ on Stack Overflow

Find centralized, trusted content and collaborate around the technologies you use most.

Teams

Q&A for work

Connect and share knowledge within a single location that is structured and easy to search.

Just downloaded and installed SDK Net 7.0.100 and it broke existing applications and they won't load any more in VS 2022 or Rider.

Copied the follwing error:

error  : SDK Resolver Failure: "The SDK resolver "Microsoft.DotNet.MSBuildSdkResolver" 
failed while attempting to resolve the SDK "Microsoft.NET.Sdk". Exception: "Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadManifestCompositionException: Workload definition 'wasm-tools' in manifest 'microsoft.net.workload.mono.toolchain.net7' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain.net7\WorkloadManifest.json] conflicts with manifest 'microsoft.net.workload.mono.toolchain' [C:\Program Files\dotnet\sdk-manifests\7.0.100\microsoft.net.workload.mono.toolchain\WorkloadManifest.json]
   at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.ComposeWorkloadManifests()
   at Microsoft.NET.Sdk.WorkloadManifestReader.WorkloadResolver.Create(IWorkloadManifestProvider manifestProvider, String dotnetRootPath, String sdkVersion, String userProfileDir)
   at Microsoft.NET.Sdk.WorkloadMSBuildSdkResolver.CachingWorkloadResolver.Resolve(String sdkReferenceName, String dotnetRootPath, String sdkVersion, String userProfileDir)
   at Microsoft.DotNet.MSBuildSdkResolver.DotNetMSBuildSdkResolver.Resolve(SdkReference sdkReference, SdkResolverContext context, SdkResultFactory factory)
   at Microsoft.Build.BackEnd.SdkResolution.SdkResolverService.TryResolveSdkUsingSpecifiedResolvers(IList`1 resolvers, Int32 submissionId, SdkReference 
                Try a clean build.  When changing Net version the compiler doesn't recognize changes and net and you may still have intermediate obj files that were compiled with old net version.
– jdweng
                Nov 8, 2022 at 18:35
                @jdweng it won't help, it's not a build issue, this manifests are conflicting indeed, they do not depend on build
– YMC
                Nov 9, 2022 at 3:49
                @ymc : Deleting all the directories like you stated is a clean build. In some cases the automatic updates in Net fail.  Then you have to manually delete the reference to library in Solution Explorer and add again so the version of the library gets updated.  What I said will help.  I understand the issue very well.
– jdweng
                Nov 9, 2022 at 9:53
                I kind of took half the advice, I uninstalled 7.0.100 using add/remove then installed the lastest 6.0 SDK, dotnet.microsoft.com/en-us/download/dotnet/thank-you/…  And for me that worked, thanks.
– David
                Nov 8, 2022 at 20:10
                I didn't even have to change the target framework. Just uninstalling 7.0.100-preview made my project load. Wow! do I love searching my error message and finding an SO question that was asked and answered teh same day I had the error!!
– Tim
                Nov 8, 2022 at 21:34
                You all will see this problem when you update VS 2022 to the lastest version, after I got it working using above, I updated VS 2022 to lastest version and the problem reappeared.
– David
                Nov 8, 2022 at 21:38
                I just uninstalled the preview version of .Net 7 and it works for me. My projects were targeting .Net 6 SDK.
– Manish Bhalodi
                Nov 9, 2022 at 6:50
                On MacOs: I just deleted the whole dotnet folder sudo rm -rf /usr/local/share/dotnet and installed .net 7 again. Then it worked
– Marco
                Nov 9, 2022 at 15:09
EDIT: This is officially documented in the release notes known issues.
I'm from the .NET SDK team. Sorry you're going through this. I would love to comment on the other answers, but I don't have the reputation to do so.
What Tim Farley suggested is an officially endorsed workaround; uninstalling any preview 7 SDKs with add/remove programs should resolve the problem.
As for why this happened and why uninstalling preview SDKs will fix the issue, there's a bit of an explanation I put here: https://github.com/dotnet/sdk/issues/28947#issuecomment-1307987337.
TLDR: Some workloads were renamed in the middle of .NET 7 preview development to support things like multitargeting, and when you download the new RTM old preview files interfere can with it.
Updating the TargetFramework is recommended but it's unrelated to this issue. Usually breaking changes for each .NET version and related new features are gated behind your TargetFramework (TFM), so things don't break until you update the TFM, not when you update the SDK. (Unfortunately, not true in this case.)
In response to whether this will happen again or not when upgrading to .NET 8, per Scott: with how workloads are currently structured this issue would happen again. We're discussing how to make changes to prevent this from happening again though as it's not ideal. We're also considering adding dotnet workload clean or something to repair this for you. Communicating with us on the SDK GH thread, or with me here, is a good way to send us feedback about this.
                Having wasted a few hours on this today, if none of the other solutions work, the post from walterlv in the github link finally sorted this out for me.
– Robbie Dee
                Nov 9, 2022 at 22:24
                Frankly, .NET workloads should be removed. It is overthought/overengineered. I understand why they are there, but EVERY release they just cause problems. I have 2/3 development workstations "bricked", where I have no idea why projects just stopped working. I have used .NET 7 preview 1 -> RC2 perfectly OK...RTM drops and everything just breaks. It has been a mess since .NET 5.
– Bart Czernicki
                Nov 12, 2022 at 23:49
Repairing Visual Studio installation did not help me. Neither did uninstalling .NET 7 faulty workload ('wasm-tools'), since any attempt to uninstall or repair it ended up in the same error message.
Being ran out of conventional options to address the issue, I just went ahead and physically deleted the conflicting folder: microsoft.net.workload.mono.toolchain, leaving second one microsoft.net.workload.mono.toolchain.net7 intact. It luckily solved problems on my machine. From now on I'll be more cautious on installing Ms RC packages
                I did this and it worked. I have no idea if we'll get back in this state on the next update, but at least I can keep coding.
– Scott
                Nov 9, 2022 at 7:03
                developercommunity.visualstudio.com/t/…  Yáll can upvote for it to be fixed to the engineering team
– Joseph Wambura
                Nov 9, 2022 at 11:06
                this is the easiest solution, if in windows 11 like me use the "Search Apps" filter textbox in Apps and Features to find the SDK and uninstall it.
– Alas
                Nov 9, 2022 at 14:35
                Didn't work for me - threw up some random error message. When I tried to uninstall a similar one, it said it could only be done in the VS installer.
– Robbie Dee
                Nov 9, 2022 at 22:22
I had the same issue as above except on my M1 mac. I followed the following guide and manually removed all the directories for all the .net 7 runtimes and sdks. Then reinstalled .net7 and all seems to be well now. rider can open my projects and the dotnet cli no longer complains
Not sure if a similar scorched earth approach will work for the windows folks.
https://devkimchi.com/2021/11/24/removing-dotnet-sdks-from-macos-manually/
I had the same issue, except that no preview version of .NET 7 was currently installed on my system, but the preview artifacts were still in the C:\Program Files\dotnet\sdk-manifests\7.0.100 directory. My solution was to uninstall the stable version of .NET 7 (not the version from VS 2022), then install and uninstall 7.0.100-preview.7. Doing so resulted in the preview artifacts being removed and this error being resolved.
                Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.
– Community
                Nov 30, 2022 at 18:25
        
Thanks for contributing an answer to Stack Overflow!
Please be sure to answer the question. Provide details and share your research!
But avoid …
Asking for help, clarification, or responding to other answers.
Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.