

FmFileIOAccessor default createDirectory: dirString.
calls
createDirectory: fullPathName
^self primCreateDirectory: fullPathName asVmPathName
and this causes an error
primCreateDirectory: fullPath
"Create a directory named by the given path. Fail if the path is bad or if a file or directory by that name already exists."
<primitive: 'primitiveDirectoryCreate' module: 'FilePlugin'>
self primitiveFailed