I got mine back up and working by doing the following:
1st Icopied the files on the SD Card to my pc (for backup)
2nd I deleted all the files on the SD Card
3rd I went to the following link
https://www.navigon.com/site/us/en/my_navigon/unauthorized/products_us
and download the update for Navigon 2100 and installed it.
Tested it and it no longer gives me the fatal error.
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