First of all, thanks for buying the game and reporting the bug. Ironically I just had another user report that bug via Twitter this morning and I just finished fixing it a few minutes ago! I'm planning to release the latest version, which will include this fix and a bunch of new features, later this week. All of the code is done but I need to do final testing before release. I'm hoping to have the new version up on Thursday night.
The bug is caused because my region uses a period as a decimal point. Your region must use a comma. The game is trying to load a file that has numbers like "1.5" in it but your region settings make this an invalid number. If you do not live in a country that uses a comma as the decimal separator please let me know! That would mean that I may not have fixed your bug.
Thanks for your patience, I'll have this release tested and posted ASAP!