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You weren't by chance trying to open a 2015 Inventor file in 2014 were you? I can replicate that same error when I accidentally tried to open a test file in 2014 that was created in 2015.
I think the problem was the fact that my colleague opened it up in 2015, whereas I have yet to get the software update.
I opened up the old version and it was fine. Thank you.
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