[Pharo-project] Squeaksource: unable to import a version

Hi, I am trying to import a file into a repository in Squeaksource because Monticello failed doing so. But I get the this message all the time: There was an error importing the file Ring-History-Importer-AndyKellens.69.mcz. The file has to be in mcz format! The file is not there but SS does not allow me to import it. How can I import the file then? Regards, Veronica