How to solve Microsoft.Data.Entity.Design.Package.MicrosoftDataEntityDesignBootstrapPackage Problem?

I got this error message when I open the project in vs2008

The Microsoft.Data.Entity.Design.Package.MicrosoftDataEntityDesignBootstrapPackage, Microsoft.Data.Entity.Design.Package, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a ({7A4E8D96-5D5B-4415-9FAB-D6DCC56F47FB}) did not load because of previo开发者_StackOverflow社区us errors. For assistance, contact the package vendor. To attempt to load this package again, type 'devenv /resetskippkgs' at the command prompt.

Please guide me how to solve. Thanks