This is a common error a good number of people have encountered when using save files from 0.0. I can't say exactly why it occurs (I think it's because of plugins that were added post-0.0's release), but using a clean save is known to fix it.
There's a 0.1 save file in the ZIP folder that you can use to skip ahead to the first shrunken segment - instructions on how to install the save file correctly are included as well!