Hello all, I'm getting the below error each time a try to commit changes in Traits in a project that uses GitFileTree and Pharo 6.0. I've noticed that ConfigurationOfGitFileTree loads (for Pharo 6.0) FileTree from: github://dalehenrich/filetree:pharo6.0_dev/repository/ If I update to use the "pharo6.0" branch instead of "pharo6.0_dev" then I can commit the changes without error. By the way, should not the "stable" version of GitFileTree depends on an stable branch of FileTree, instead of the development branch? This is the stack trace of the error I get: ===== UndefinedObject(Object)>>doesNotUnderstand: #select:thenCollect: MCTraitDefinition(MCClassDefinition)>>selectVariables: MCTraitDefinition(MCClassDefinition)>>instVarNames MCGitFileTreeWriter>>buildClassDefinition: MCGitFileTreeWriter>>writeClassDefinition:in: [ :each | self writeClassDefinition: each in: aPackagePath , '/' , each className , '.class' ] in MCGitFileTreeWriter>>writeClassDefinitions:in: OrderedCollection>>do: MCGitFileTreeWriter>>writeClassDefinitions:in: [ :job | job title: 'Building snapshot'. orderedDefinitions := MCDependencySorter sortItems: aSnapshot definitions. job progress: 0.1. classDefinitions := orderedDefinitions select: [ :e | e isKindOf: MCClassDefinition ]. traitDefinitions := orderedDefinitions select: [ :e | (e isKindOf: MCTraitDefinition) or: [ e isKindOf: MCClassTraitDefinition ] ]. classAndTraitNames := (classDefinitions , traitDefinitions collect: [ :e | e className ]) asSet. job progress: 0.2. methodDefinitions := orderedDefinitions select: [ :e | (e isKindOf: MCMethodDefinition) and: [ classAndTraitNames includes: e className ] ]. extensionMethodDefinitions := orderedDefinitions select: [ :e | (e isKindOf: MCMethodDefinition) and: [ (classAndTraitNames includes: e className) not ] ]. organization := orderedDefinitions select: [ :e | e isKindOf: MCOrganizationDefinition ]. extensionClasses := (extensionMethodDefinitions collect: [ :e | e className ]) asSet. job progress: 0.3. self outputFileDelete: aPackagePath. self writePackageGitPropertiesIn: aPackagePath. self writeOrganization: organization in: aPackagePath. job progress: 0.4. self writeClassDefinitions: classDefinitions in: aPackagePath. self writeTraitDefinitions: traitDefinitions in: aPackagePath. job progress: 0.5. self writeMethodDefinitions: methodDefinitions in: aPackagePath. job progress: 0.6. self writeExtensionClassDefinitions: extensionClasses in: aPackagePath. self writeExtensionMethodDefinitions: extensionMethodDefinitions in: aPackagePath. job progress: 0.7. self writeInitializers: methodDefinitions in: aPackagePath ] in MCGitFileTreeWriter>>writeSnapshot:in: BlockClosure>>cull: [ ^ block cull: self ] in [ self prepareForRunning. CurrentJob value: self during: [ ^ block cull: self ] ] in Job>>run [ activeProcess psValueAt: index put: anObject. aBlock value ] in CurrentJob(DynamicVariable)>>value:during: BlockClosure>>ensure: CurrentJob(DynamicVariable)>>value:during: CurrentJob class(DynamicVariable class)>>value:during: [ self prepareForRunning. CurrentJob value: self during: [ ^ block cull: self ] ] in Job>>run BlockClosure>>ensure: Job>>run MCGitFileTreeWriter>>writeSnapshot:in: [ :each | | packageDir | packageDir := subDirectoryString , each package name , '.package'. aWriter writeSnapshot: each snapshot in: packageDir. aWriter outputFileModify: packageDir , '/monticello.meta/package' with: '(name ''' , each package name , ''')'. aWriter writeDependencies: each dependencies in: packageDir ] in MCGitFileTreeWriter class>>fileOutAll:on: OrderedCollection>>do: MCGitFileTreeWriter class>>fileOutAll:on: MCFileTreeGitRepository>>fiStoreVersions: MCFileTreeGitRepository>>fiStoreVersion: MCFileTreeGitRepository>>basicStoreVersion: MCFileTreeGitRepository(MCRepository)>>storeVersion: MCFileTreeGitRepository(MCFileBasedRepository)>>storeVersion: MCWorkingCopyBrowser>>storeVersion:in: [ self storeVersion: newVersion in: aRepository; storeDependencies: newVersion in: aRepository ] in [ [ self storeVersion: newVersion in: aRepository; storeDependencies: newVersion in: aRepository ] ensure: [ (MCVersionInspector new version: newVersion) show ] ] in MCWorkingCopyBrowser>>basicSaveVersionIn: BlockClosure>>ensure: [ [ self storeVersion: newVersion in: aRepository; storeDependencies: newVersion in: aRepository ] ensure: [ (MCVersionInspector new version: newVersion) show ] ] in MCWorkingCopyBrowser>>basicSaveVersionIn: BlockClosure>>ensure: CursorWithMask(Cursor)>>showWhile: MCWorkingCopyBrowser>>basicSaveVersionIn: [ self basicSaveVersionIn: self repository ] in MCWorkingCopyBrowser>> saveVersion [ self value. Processor terminateActive ] in BlockClosure>>newProcess ==== Thank you in advance.