Problems upgrading to Sitefinity 4 SP1

Hi,

I am trying to upgrade to SF4 SP1, so I've downloaded the project manager and upgraded the project from Visual Studio.

I have a custom library along with the project that I updated the references to the new DLLs in the bin of the Sitefinity project (version : 4.0.1210.0, Runtime version : v4.0.30319)

Along with this, I have a user control within the Sitefinity project itself, but I believe there are no references to update for this case.

When I build the whole, it succeeds, but when I run the project I get :

Could not load file or assembly 'Telerik.Sitefinity, Version=4.0.1098.0, Culture=neutral, PublicKeyToken=b28c218413bdf563' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

I appreciate your help.

Thank you.

Oh Never mind, I figured it out,

The DLL from the external library should be replaced by the new one into the bin folder of Sitefinity.