This is a fairly common error which you get when installing EA add-ins – something has gone wrong with the install, but this is the first clue EA gives you.
It’s so common that someone has written a debug aid, to help us understand what has happened, and which is available from the Sparx Community website: http://community.sparxsystems.com/community-resources/772-ea-installation-inspector
I’m not an expert in that particular tool (but I know a man who is, ‘cos he wrote it..) but I suggest downloading and running it, and see what it says.
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