devenv and vsewss 1.3 package

I'm tying to package a vsewss 1.3 solution in cmd. I get it to build and all seems to work unt开发者_StackOverflow中文版il it starts the deployment then i get the error message: Specified method is not supported.

my command is: devenv xxx.sln /deploy Release /package has also tried: devenv xxx.sln /deploy Release

Try opening the solution in visual studio and seeing the package inside the WSP View (View => Other Windows), see if there's any problem with the solution parsing.

Also, any specific reason to create the package outside Visual Studio?