Just to piggie-back of Ank's explanation, if we get a little more detail we can probably help further as this is the first I've heard of anyone having this error. Let's run through a few of the typical issues:
- Are you using any additional mods?
- Is this an existing save or save that was made using another mod?
- Is the load order correct and all of the mods the specific version numbers listed in the main page?
- Is Ralph's enabled in expansionsettings.gd or are you using the mod as released?
- Have you done any manual editing of the save game?
- If you run the game using that debug executable, does the console give you any error messages? A screenshot would be ideal if so.
Just let us know and we'll be happy to help get it sorted for you asap