Error occurred in deployment step 'Retract Solution': Cannot start service SPUserCodeV4 on computer

Error occurred in deployment step 'Retract Solution': Cannot start service SPUserCodeV4 on computer

Title: SharePoint 2010 Error occurred in deployment step 'Retract Solution': Cannot start service SPUserCodeV4 on computer

Details: Building Sandboxed Solutions on SharePoint 2010 using Visual Studio 2010 Beta and encountered the error? Then make sure that the service Microsoft SharePoint Foundation User Code Service ( CA > System Settings > Services on Server ) is Started.