Reported as http://code.google.com/p/pharo/issues/detail?id=1741 Gofer is broken on PharoCore 1.0. Can't run code like: Gofer it renggli: 'unsorted'; package: 'RFB'; load. and when updated with: Gofer gofer update. fails with an error. The fix is the same as http://code.google.com/p/pharo/issues/detail?id=1680