Yea, those are errors that have already been brought to the dev's attention. He couldn't find any error in the code, so he has no idea why the error message is popping up. He says he made no changes to the script for those days between updates, but the error started popping up anyway. Unless someone can dive into the script and find an error, I don't know if those errors will be fixed.
The temporary solution is to play v0.5 and make all your choices. The errors only pop up from v0.6 and beyond. It's not ideal, but it's a workaround, and a couple of those choices are very important, especially the party error. So, if you want to see all the paths, then download v0.5 before moving on to v0.6. And as a note, this workaround works for all future updates, too. Here's the link to v0.5
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P.S.: OP, consider including the download link for v0.5 on the front page with a note that everyone should play v0.5 first before moving on to the latest update. That way, they'll be able to play through the game with no errors.