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Yep. I created the Multiple Save Files Script(by that I mean I added mej71's) to my game. Then I tried it out, and tried on my current save to create a new save file. It acted like usual. Then, I deleted the save file, and started a new game. Tried saving it, bam, same thing.
Looking at the error message again, I don't think the issue is within the scripts mentioned. From the looks of it, they're all trying to call up that apparently undefined method in some way or another. We need to find where it's at, because that's the issue.
However, as far as I know, it could be almost anywhere in the scripts. At this point, importing everything to a clean version of Essentials would probably be much less tedious than the alternative: replacing each section of script until you find out which was causing the problem.
Yeah; it would be easier and, probably, quicker.
If I knew more about the Ruby language and what precisely was going on/how to fix it, I might suggest defining the method the error message was talking about. I'm not sure how one would go about doing that, though.