Because you are using the wrong xml definition file. Try tu use the latest ones for the EDM cars (you may find them on the forum, hit the "search", or try here: http://forums.openecu.org/viewtopic.php?t=925 ). I had the same story for my EDM EVO 9, definition 88840016.
Ok, but not ok. Now the only file definition you have is for the 88840016. I suggest you replace all your xml files with the xml-package containts you find in the link I gave you, otherwise the only car you could read/write is yours (assuming that you use the correct definition now).