grrrr I don't know what is happening. I am building a PharoDev 1.3 and at the end, I do: Undeclared removeUnreferencedKeys but this throws an error that I attach. It is a big loop of such error. The progress bar is showing "Clean up in DebuggerMethodMap" In addition Undeclared ->>>> a Dictionary(#NoSuchElementError->nil ) I checked http://code.google.com/p/pharo/issues/detail?id=4043 but there is no such method. Now...if I execute Undeclared removeUnreferencedKeys again, it works. The bad news is that this prevents the PharoDev 1.3 to be build.... I have no clue of what can be happening, but the only way I found so far to reproduce it is to: Gofer new squeaksource: 'PharoTaskForces'; pacakge: 'ConfigurationOfPharo'; load. And then: (ConfigurationOfPharo project version: '1.3-beta') load -- Mariano http://marianopeck.wordpress.com