Project conflicts with itself?

[martho]

Hello.

I'm writing my first bigger C#-Application, which has worked fine so far. But suddenly (don't know what I did), I get over 130 warnings like:

D:\Src\MyApp\TabCustomers.cs(12,51): warning CS0436: The type 'MyApp.Tabs.TabBase' in 'D:\Src\MyApp\TabBase.cs' conflicts with the imported type 'MyApp.Tabs.TabBase' in 'D:\Debug\MyApp\MyApp.exe'.

The code is:

namespace MyApp.Tabs
{
    public partial class TabCustomers : MyApp.Tabs.TabBase
..

I understand that somehow "TabBase" seem to be defineid twice, but I don't know why, becaus MyApp.exe is the .exe right from THIS project. So how could this project conflict with itself?

If I clean the project, I get no more warnings till I compile the src again...