Random "namespace name 'Core' does not exist in namespace ' Tweetinvi"

Question

I'm using the Tweetinvi C# Twitter API. It was working great until about 3 hours ago, when my solution (specifically one project) just stopped building.

The error is a normal Assembly/Reference missing error, but I can see the files listed in the "references" folder. If i refresh the project, the errors go away. Until i build, then they come back.

This is the same as this post, but my project does not target the client profile, its targets .NET 4 (Project>Properties>Application>Target Framework, right?), like it did this morning, like it did yesterday.

I've uninstalled and reinstalled the Tweetinvi package via Nuget. Removed the references and re-added manually. No change.

EDIT: To keep the crazy up, if i go to the Object Browser, and view by Namespace, there is only {}Tweetinvi.Security. If i refresh the project, i get them ALL back. Until I build.

EDIT2: One of the warnings i get on build.

The primary reference "Tweetinvi, Version=0.9.3.3, Culture=neutral, processorArchitecture=MSIL" could not be resolved because it has an indirect dependency on the framework assembly "System.Threading.Tasks, Version=2.5.19.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0". To resolve this problem, either remove the reference "Tweetinvi, Version=0.9.3.3, Culture=neutral, processorArchitecture=MSIL" or retarget your application to a framework version which contains "System.Threading.Tasks, Version=2.5.19.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".

Can you check to see if you've added a reference to your own project? — Lasse V. Karlsen, Aug 08 '14 at 13:07
Check the references for your project, if you have the project name (of itself) listed as a reference, that's what I'm asking about. I doubt it as well, but I know that with a self-reference you will get spurious odd problems. Not sure the one you list is one of them, but worth a check. — Lasse V. Karlsen, Aug 08 '14 at 13:11
Thats what I thought you meant, but I asked just to be sure. No it does not reference itself. — Matthew Peel, Aug 08 '14 at 13:13
Visual studio... Is it possible to create a new project, add the package to that one and build? What happens? — hschne, Aug 08 '14 at 13:13
Perhaps you already did this - but check for all dependencies versions of tweetinvi package. Maybe a version mismatch somewhere. — Ilya Luzyanin, Aug 08 '14 at 13:14
Created new project, moved offending class to it, added Tweetinvi via nuget, builds fine. — Matthew Peel, Aug 08 '14 at 13:22

score 1 · Accepted Answer · edited May 23 '17 at 12:11

Ok, after some more Goolging on the Error showing in EDIT2, I found this SO post, and specifically the answer by fahadash. This fixed my issue. I had changed these properties in the GUI, but it wasn't until I went and did it manually (With Sublime Text), that it took effect.

Here is a copy of fahadash's answer

I found this Blog post from Nansen and I applied the fix and got my issue resolved.

Summary of the solution: Edit the csproj file in XML editor and find the elements for the references that are troubling you and add the following child element to those.

<SpecificVersion>True</SpecificVersion>

Make sure the word True is only first letter uppercase (True, not true or TRUE).

Save and reload the project in VS and build it.

Random "namespace name 'Core' does not exist in namespace ' Tweetinvi"

1 Answers1