When I try to build Dojo 1.2rc1 with Dojo Toolbox 1.0.1 I got this error in the Output Log:

Build output log
starting build
got argumentPairs: action=clean,release, dojodir=C:\JSFplugins\dojo-release-1.2.0rc1, profileFile=C:\JSFplugins\dojo-release-1.2.0rc1\util\buildscripts\profiles\standard.profile.js, releaseDir=C:\JSFplugins\dojo-release-1.2.0rc1\releaseMario, version=1.0.0.dev, optimize=none, copyTests=false
buildrunner.go
buildUtil.makeBuildOptions
buildUtil.evalProfile: C:\JSFplugins\dojo-release-1.2.0rc1\util\buildscripts\profiles\standard.profile.js
clean: Deleting: C:\JSFplugins\dojo-release-1.2.0rc1\releaseMario/dojo
release: Using profile: C:\JSFplugins\dojo-release-1.2.0rc1\util\buildscripts\profiles\standard.profile.js
release: Using version number: 1.0.0.dev for the release.
release: Deleting: C:\JSFplugins\dojo-release-1.2.0rc1\releaseMario/dojo
release: Copying: ../../dojo/../dijit to: C:\JSFplugins\dojo-release-1.2.0rc1\releaseMario/dojo/dijit
release: Copying: ../../dojo/../dojox to: C:\JSFplugins\dojo-release-1.2.0rc1\releaseMario/dojo/dojox
release: Copying: ../../dojo to: C:\JSFplugins\dojo-release-1.2.0rc1\releaseMario/dojo/dojo
release: Building dojo.js and layer files
release: Error in build (Creating dojo.js and layer files): TypeError: Value undefined (result of expression dojo.registerModulePath) is not object.
release: Stack trace:
release: 332 - http://localhost/airbuild/buildscripts/jslib/buildUtil.js
release: 675 - http://localhost/airbuild/buildscripts/jslib/buildUtil.js
release: 675 - http://localhost/airbuild/buildscripts/jslib/buildUtil.js
release: 675 - http://localhost/airbuild/buildscripts/jslib/buildUtil.js
release: 201 - http://localhost/airbuild/buildscripts/buildrunner.js
release: 201 - http://localhost/airbuild/buildscripts/buildrunner.js
release: 201 - http://localhost/airbuild/buildscripts/buildrunner.js
release: 201 - http://localhost/airbuild/buildscripts/buildrunner.js

Any idea ?