The configuration was not valid, in the Metacello sense. It has a development: and stable: symbolic, but without an associated version. I simply "fixed" this by adding two version, 0.8 and 0.9. 0.8 is actually not necessary, but it helps getting Metacello stop complaining. Alexandre On 27 May 2011, at 10:47, Tudor Girba wrote: -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.