Install-SPSolution : This solution contains no resources scoped for a Web appli cation and cannot be deployed to a particular Web application.

Question

I have a powershell script that deploys about 12 web parts. They have all been created in the manner through visual studio 2010 and are being deployed to sharepoint 2010.

I am getting the following error when running Install-SPSolution for one of my web parts: Install-SPSolution : This solution contains no resources scoped for a Web appli cation and cannot be deployed to a particular Web application.

Can someone help me debug this? Every other Install-SPSolution command uses -AllWebApplications, and I do not want to specify the web application directly using -URL. Here is the command that is breaking (this is the same command used to successfully deploy all 11 other web parts):

Install-SPSolution –Identity PortalSelector.wsp -AllWebApplications -GACDeployment

Thanks.