FrameworkReference 'Microsoft.NETCore.App' was not recognized at (264: 5)

[rodrigodevelms]

Hi guys.
I am using Debian 10.1, and today I upgraded net core, version 3.0 to 3.0.1 and my application crashed.
Error: "FrameworkReference 'Microsoft.NETCore.App' was not recognized at (264: 5)"

dotnet version :
3.0.101

mono version
Mono JIT compiler version 6.4.0.198 (tarball Tue Sep 24 01:24:35 UTC 2019)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
Interpreter: yes
LLVM: yes(610)
Suspend: hybrid
GC: sgen (concurrent by default)

[dagood]

How do you acquire .NET Core? The Debian 10 instructions at https://dotnet.microsoft.com/download/linux-package-manager/runtime-current?

Can you post more context around the error, maybe a repro project and steps?

[dagood]

I believe @craigjbass hit the same issue and posted more details at #3879 (comment) (many thanks!), copying here because I'm 98% sure it's the same issue and we need to keep track of it:

A few things here @dagood -

1. I removed dotnet packages entirely to be able to perform a system upgrade.
2. Went to reinstall dotnet 3.0.0 - so I followed the advice here: CentOS, Fedora, openSUSE, RHEL error "checksum doesn't match" "Package does not match intended download" "Digest verification failed" #3853 (comment)

I think there is something not quite right with the published dependency graph from the dotnet-sdk-3.0 package:

> $ sudo dnf install dotnet-sdk-3.0                                                                                                                                                                                                 ⬡ 10.7.0 
Last metadata expiration check: 0:09:35 ago on Thu 21 Nov 2019 15:38:13 GMT.
Dependencies resolved.
==============================================================================================================================================================================================================================================
 Package                                                              Architecture                                  Version                                          Repository                                                          Size
==============================================================================================================================================================================================================================================
Installing:
 dotnet-sdk-3.0                                                       x86_64                                        3.0.101-1                                        packages-microsoft-com-prod                                         64 M
Installing dependencies:
 aspnetcore-runtime-3.0                                               x86_64                                        3.0.1-1                                          packages-microsoft-com-prod                                        7.5 M
 aspnetcore-targeting-pack-3.0                                        x86_64                                        3.0.1-1                                          packages-microsoft-com-prod                                        1.4 M
 dotnet-apphost-pack-3.0                                              x86_64                                        3.0.1-1                                          packages-microsoft-com-prod                                         66 k
 dotnet-host                                                          x86_64                                        3.0.1-1                                          packages-microsoft-com-prod                                         39 k
 dotnet-hostfxr-3.0                                                   x86_64                                        3.0.1-1                                          packages-microsoft-com-prod                                        147 k
 dotnet-runtime-3.0                                                   x86_64                                        3.0.1-1                                          packages-microsoft-com-prod                                         29 M
 dotnet-runtime-deps-3.0                                              x86_64                                        3.0.1-1                                          packages-microsoft-com-prod                                        2.8 k
 dotnet-targeting-pack-3.0                                            x86_64                                        3.0.1-1                                          packages-microsoft-com-prod                                        3.4 M

Transaction Summary
==============================================================================================================================================================================================================================================
Install  9 Packages

Total download size: 105 M
Installed size: 105 M
Is this ok [y/N]: y

This completed successfully, with the manual install of sudo dnf install -y https://packages.microsoft.com/centos/7/prod/netstandard-targeting-pack-2.1.0-x64.rpm

But I then got this error

15:50	Project 'Frank.EndToEndTests' load finished with warnings: The FrameworkReference 'Microsoft.NETCore.App' was not recognized at (264:5)

Which seemed rather odd.

I then manually installed this package https://packages.microsoft.com/centos/7/prod/dotnet-targeting-pack-3.0.0-x64.rpm

And everything worked!

• I think the dotnet-sdk-3.0 package should have a dependency on dotnet-targeting-pack-3.0.0, unless I'm missing something?
• It's more than a checksum issue, I think there are some issues with the yum repos

Hmm - just relooking over the dnf transaction output - it does include dotnet-targeting-pack-3.0

These are for 3.0.1!

==============================================================================================================================================================================================================================================
 Package                                                               Architecture                                       Version                                              Repository                                                Size
==============================================================================================================================================================================================================================================
Downgrading:
 dotnet-targeting-pack-3.0                                             x86_64                                             3.0.0-1                                              @commandline                                             3.4 M

Transaction Summary
==============================================================================================================================================================================================================================================
Downgrade  1 Package

I think the packages are missing the minor version which is causing major confusion!

Notice that yum is treating this as a downgrade, so I can't target 3.0.1 and 3.0.0 on the same machine. :sadface:

EDIT: dnf repos expect these packages to respect semver. I think we should have dotnet-targeting-pack-3.0.0 and dotnet-targeting-pack-3.0.1 packages published separately so that they can both be installed side-by-side

EDIT EDIT: 🤔 so the alternative here I see is that the 3.0.1-1 is supposed to be backwards compatible, and there's actually a defect in it.

[dagood]

The root issue here is that dotnet-targeting-pack-3.0-3.0.1 shouldn't have been published at all. 3.0.0 should be the latest. @leecow, can these be removed?

(In future 3.0 patches, this won't be an issue because we won't even build targeting packs we don't intend to release. We didn't have this protection while building 3.0.1. dotnet/core-setup#8827.)

---

I think we should have dotnet-targeting-pack-3.0.0 and dotnet-targeting-pack-3.0.1 packages published separately so that they can both be installed side-by-side

You should never need a targeting pack from a lower patch version. We include major.minor in the package name so that you can install multiple .NET Core versions side-by-side, but only the latest patch of each one.

This problem should be self-healing if your machine has access to the internet... the SDK will detect that you don't have 3.0.0 installed, download Microsoft.NETCore.App.Ref 3.0.0 from nuget.org to your user directory, and use that. Targeting packs (".Ref") don't roll forward so the version match needs to be exact.

We intend to support offline scenarios so this is something that I believe needs fixing.

[dagood]

@craigjbass taking another look at this, I do think that having dotnet-sdk-3.0-3.0.101 depend on exactly dotnet-targeting-pack-3.0.3.0.0 would be another way to solve this, and would be more robust for other situations too. I opened dotnet/installer#5738 to track and discuss this. (There might be reasons to keep this version "floating" that I forgot or don't know, we'll see there.)

[nguerrera]

I mentioned to @mmitche that we needed to avoid pushing these, but there was a lot of things having to go on for that release.

[nguerrera]

I would still not publish packages that aren't intended to be used, even if sdk were stricter about avoiding them. Which is what we will do moving forward, right:not publish unless they are actually needing a patch?

[dagood]

I would still not publish packages that aren't intended to be used, even if sdk were stricter about avoiding them. Which is what we will do moving forward, right:not publish unless they are actually needing a patch?

Agreed completely, and yes, we merged dotnet/core-setup#8827 for 3.0.2+ so that we won't even create these packages unless there's a patch.

[rodrigodevelms]

Thank's all for helping. But something very strange happened.
I installed netcore by adding the repository to debian repo.
I deleted the obj and bin folders and the error continued.
Even creating a new project, the error persisted.
So I decided to restart the laptop, and everything worked. Very strange.

[mtarlac]

Same problem here...

Reinstall doesn't help

dotnet --info
.NET Core SDK (reflecting any global.json):
Version: 3.0.101
Commit: bc5f8df0f5

Runtime Environment:
OS Name: linuxmint
OS Version: 18.3
OS Platform: Linux
RID: linuxmint.18.3-x64
Base Path: /usr/share/dotnet/sdk/3.0.101/

Host (useful for support):
Version: 3.0.1
Commit: 19942e7199

.NET Core SDKs installed:
3.0.101 [/usr/share/dotnet/sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.0.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.0.1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
https://aka.ms/dotnet-download

[dagood]

Heads up, I think this is still known and expected to be broken at the moment.

It would be helpful if someone could provide a repro project. I'm aware of one scenario that is broken: installing .NET Core SDK, turning off your internet, then trying to build, but that doesn't seem to be what you're hitting in this thread.