Another SharePoint 2010 deployment error

If you run into this error when deploying a sharepoint solution from Visual Studio 2010:

Error occurred in deployment step 'Retract Solution': The language-neutral solution package was not found.

The chance is this solution wasn't properly retracted, and SharePoint still thinks it is installed. A simple way to fix is to change solution GUID. The GUID and wsp name is defined in the Package\Package.package, but you need to open this file in text editor such as Notepad (not  in Visual Studio), and restart Visual Studio.

Visual Studio 2010 deployment: Error occurred in deployment step 'Activate Features': Feature with Id '320ed40e-cf38-493b-9bc3-7fd3b01e8524' is not installed in this farm, and cannot be added to this scope.

If you get this error while deploying from Visual  Studio 2010, the chances are you have a multiple-servers farm, and Visual Studio can only deploy the solution to its local server.