Are you trying to load a savegame that was not made at the end of 0.14? This is usually the error you get in this case. If hitting "rollback" doesn't fix it, then I would try donwloading 0.14 and try saving when the game tells you to save again. Use this savegame then to play 0.17.
For some reason my computer didn't unzip it correctly. I deleted it and unzipped it again, then it worked fine, the folder even looked different after that ... first install showed blank files on the folder icon, second time it was showing an image, so I knew something was different, it's been working fine now.
But yeah, I also get the error when I try to load a previous save that's too far back into 0.14.
And also, OMG ... the scene with all three redheads in 0.17, holy shit ....... thank you for that. I cannot wait to see more -