Unfortunately if it won't play ball there's little you can do. It should accept your lens, but you don't give any details of how it's not accepting it. Is it just not mounting onto the body, or is the camera simply unable to operate with the lens attached?
Proneas were feature packed, but abysmally engineered and constructed so I'm stunned that you still have a functional example. Like all APS models, the camera is no longer supported, any attempt to fix it is likely to make things worse.
If your Pronea works with any other lenses then just enjoy it for what it can achieve, and used wisely it can achieve very impressive results.
If you want to learn more about your camera then
click here, the article is about the cut-price successor to yours but the comments mostly apply just the same. There is also a general and rather critical article of the
APS system in general but the criticisms are entirely well-founded; after all, 35mm film is still alive and kicking in this digital age but APS is on it's last feeble gasps.
Sorry that there's no realistic prospect of a fix on this occasion, but I hope that you have still found my reply to be informative. If so, please don't forget to rate my answer.