"an unexpected error has occured" - ProjectWorkspace with connected template libray saved as template

Apr 10, 2014 at 7:49 PM
Edited Apr 10, 2014 at 7:51 PM
I saved a ProjectWorkspace with DocLib and connected template libray as a site template used for an EPT. When I create a new ProjectWorkspace based on this template and use "New from template" I get the error message "an unexpected error has occured". I 'm using Project Server/SharePoint 2010. What must be done in order the save such a site as template? Or isn't it possible to do so?