this error looks like one intended for a programmer working with the C++ api, rather than a user. I'm guessing the poly object is reporting its hex address.
FOUND 2 ERRORS in poly object 0x214f3720
... DUPLICATE EDGE REFERENCE (798) IN SAME FACE : face 476, offset 1897, local offset 6
... DUPLICATE EDGE REFERENCE (785) IN SAME FACE : face 476, offset 1898, local offset 7
There's about thirty reports, most on face 476 and some on 464. Otherwise, the file seems ok. I suspect a degenerate face or two is hidden in the data somewhere.
Short of doing a binary search (deleting half my data at a time and reloading) is there any way to track down which face is messed up??