8Unable to add installer. Could not determine file type. GUnable to add installer. The designer could not add a ProjectInstaller. SUnable to add installer. Could not find templates directory for this project type. There was an error loading app.config. Since the document being loaded uses Dynamic Properties, the config file must be valid. Correct the following error in app.config: Unable to add installer. The designer could not be shown for the ProjectInstaller class. Check to make sure there are no syntax errors in the file.