AssemblyInfo.cs could not be opened - Unspecified Error [closed]

Question

I was working offline from TFS for a while in my solution. I went back online (TFS) and when I tried to compile my solution I get this for a project I had added to this solution.

AssemblyInfo.cs could not be opened - Unspecified Error

I checked and that file is there so not sure why it can't utilize/read it.

This is an ASP.NET Web Application and the project it's complaining about here is just a regular C# class library project.

Answer 1

I have had this happened to me in the past. This can be more of a Visual Studio problem more than anything else.

What this means is that the AssemblyInfo.cs file is either missing from the Properties folder in the project or there is a permissions issue. If there is a permissions issue, update the ACL (File > Properties > Security), close and re-open the project. If missing altogether, you just need to recreate it taking the following steps:

1. Within Visual Studio 2010, select Tools > Create GUID
2. Click Copy (or New GUID then Copy)
3. Click Exit
4. Expand the Properties folder in the Solution Explorer (Control+W+S to open)
5. Delete the AssemblyInfo.cs file shown with the exclaimation point
6. Double click on the Properties folder - this should open the Properties window
7. On the Application Tab, click the Application Information... button
8. Fill in the application information, paste the GUID you copied into the GUID field - when done click OK

Source: Visual Studio 2010 Project Error AssemblyInfo.cs could not be opened

Answer 2

This error is usually thrown when the file doesn't exist locally (not on the server). Probably it was deleted by some mistake. If the file exists on the server you could obtain it from there and if it was deleted you could manually recreate and add it to the project.