(FileSystem disk workingDirectory / 'fooFolder') ensureDelete. 
(FileSystem disk workingDirectory / 'pif' ) ensureFile.
(FileSystem disk workingDirectory / 'fooFolder') ensureDirectory. 
(FileSystem disk workingDirectory / 'pif' ) copyAllTo: (FileSystem disk 
workingDirectory / 'fooFolder').

It barks and I do not why

even with 

(FileSystem disk workingDirectory / 'fooFolder') ensureDelete. 
(FileSystem disk workingDirectory / 'pif' ) ensureFile.
(FileSystem disk workingDirectory / 'fooFolder') ensureDirectory. 
(FileSystem disk workingDirectory / 'pif' ) copyAllTo: (FileSystem disk 
workingDirectory / 'fooFolder').

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