Cannot add the specified assembly

Mar 7, 2013 at 12:13 AM
I have tried both of the listed methods to install the ConsultPoint.SharePoint.RibbonVisibility.wsp but keep getting a SharePoint Foundation Error with Event ID: 6759. The description is
"The Execute method of job definition "SPSolutionDeploymentJobDefinition" (id "5521ecfd-fe2f-49fe-a15e-c5d7ee9e18d0") threw an exception. Error: Cannot add the specified assembly to the global assembly cache: ConsultPoint.SharePoint.RibbonVisibility.dll."

Any ideas how to get this to install? I am logged in as administrator and have tried logging in as a SP administrator as well as running the PowerShell as Administrator. Same thing every time.
Thanks for any guidance.