I suspect it's choking on "machineTypes" rather than "machineTypesFilter". Looking at the 5.0 vs. the 6.0 doc, I no longer see "machineTypes" in the spec file. I didn't upgrade, but I migrated an existing serverclass.conf over from a 5.0.2 install to 6.0 and got this same error.
from the 5.0.5 doc:
* This setting is deprecated. Please use machineTypesFilter instead.