Deoxiribo,
This mod is only for 1.3.8, so i am almost entirely certain that that is causing your errors. When ZC went from 1.3.7 to 1.3.8 they overhauled a LOT of code on the Admin side, which, to the end user was/is transparent. They have been working on converting tons of procedural code into a more streamlined setup.
Try upgrading to 1.3.8 and then apply the Delevery Date Mod. (I would recommend upgrading anyway because with each release there are tons of updates, feature additions, and bug fixes..).
Hope that helps!

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