1、The Silverlight 4 SDK is not installed.
打开对应的Build Definition，Process -> Advanced -> MSBuild Platform，设置：X86
2、使用Silverlight Toolkit在xaml上出现类似如下错误：
The property ‘ContextMenu‘ does not exist on the type ‘Grid‘ in the XML namespace ‘clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Input.Toolkit‘.
打开对应的Build Definition，Process -> Advanced -> MSBuild Arguments，设置：/p:ValidateXaml=false
原文：http://www.cnblogs.com/junchu25/p/4386492.html