Pharo 5 is a stable release, but the MorphExamplesAndDemos package MorphExamplesAndDemos no longer updated for use in Pharo 5.
On the bright side, the error you are reporting is not related to BouncingAtomsMorph , but to another example in the package. If the debugger window appears, you can click Abandon and still use BouncingAtomMorph by doing:
BouncingAtomsMorph new openInWorld
Maybe someone should fix the package, or we should stop mentioning it in the Pharo documentation.
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