Error Loading Data Definitions via OE Explorer

I'm trying to load a .df file using OE Explorer, but receiving the following error message:

"** Error during ADD TABLE mytable **

Invalid table attribute"

This is the bit in the .df that describes the table:

ADD TABLE "mytable"
AREA "MYAREA"
DESCRIPTION "My table description"
DUMP-NAME "mytable"

I can't find any references to these errors in the KB or documentation, so any pointers would be appreciated.

Thanks

Mike