Ciao, i work with a new Pharo 2.0 20628 image. I do first : A) Gofer new url: 'http://smalltalkhub.com/mc/DiegoLont/QCMagritte/main'; package: 'ConfigurationOfQCMagritte'; load. and: B) ((Smalltalk at: #ConfigurationOfQCMagritte) project version: '0.2') load: #( 'Demo' ). After some works the system when Fetching 1.0.2.1 of ConfigurationOfTwitteBootstrap erase the error: SmallInteger(Object)>>doesNotUnderstand: #isEmpty MetacelloMCVersionSpec>>resolveToLoadableSpecs:map: MetacelloMCVersionSpec>>resolveToLoadableSpecs: MetacelloMCVersionSpec>>expandToLoadableSpecNames: in Block: [:cache | ... MetacelloPharoPlatform(MetacelloPlatform)>>stackCacheFor:cacheClass:at:doing: in Block: [:dict | ... MetacelloPharoPlatform(MetacelloPlatform)>>useStackCacheDuring:defaultDictionary: in Block: [^ aBlock value: dict] BlockClosure>>on:do: MetacelloPharoPlatform(MetacelloPlatform)>>useStackCacheDuring:defaultDictionary: MetacelloPharoPlatform(MetacelloPlatform)>>stackCacheFor:cacheClass:at:doing: MetacelloPharoPlatform(MetacelloPlatform)>>stackCacheFor:at:doing: MetacelloMCVersionSpec>>expandToLoadableSpecNames: MetacelloMCVersion>>expandToLoadableSpecNames: MetacelloMCProjectSpec>>relativeCurrentVersion in Block: [vrsn expandToLoadableSpecNames: (loadList := self...etc... BlockClosure>>on:do: MetacelloMCProjectSpec>>relativeCurrentVersion MetacelloProjectReferenceSpec>>relativeCurrentVersion MetacelloMCVersionSpec>>isPartiallyCurrentAgainst: in Block: [:prj | ... MetacelloProjectReferenceSpec>>projectDo:packageDo:groupDo: MetacelloMCVersionSpec>>specsNamed:projectDo:packageDo:groupDo: in Block: [:name | | pkgSpec | (pkgSpec := map... Array(SequenceableCollection)>>do: MetacelloMCVersionSpec>>specsNamed:projectDo:packageDo:groupDo: MetacelloMCVersionSpec>>isPartiallyCurrentAgainst: MetacelloMCVersionSpec>>isPartiallyCurrent MetacelloMCProject(MetacelloProject)>>currentVersionAgainst: in Block: [:version | ... Array(SequenceableCollection)>>do: MetacelloMCProject(MetacelloProject)>>currentVersionAgainst: in Block: [:cache | ... MetacelloPharoPlatform(MetacelloPlatform)>>stackCacheFor:cacheClass:at:doing: in Block: [:dict | ... MetacelloPharoPlatform(MetacelloPlatform)>>useStackCacheDuring:defaultDictionary: in Block: [^ aBlock value: dict] BlockClosure>>on:do: MetacelloPharoPlatform(MetacelloPlatform)>>useStackCacheDuring:defaultDictionary: Any idea? Thanks, Dario