出现如下错误：
1.blend for visual studio sdk for .net 4.5 package failed.
2. blend for visual studio sdk for silverlight 5 package failed.
3.blend for visual studio sdk for add-in for adobe fxg import package failed.
4. microsoft expression blend for sdk for silverlight 4 package failed.
5. microsoft expression blend for sdk for .net 4 package failed.
怎么解决？