Ok. The problem lies in the fact no mod is addressed in the report as being the cause of the problem. The reasoning that a mod meant for 1.6.2 is trying to generate a structure in a 1.6.4 environment is a more likely cause of the issue; however without a specific indication as to what precisely is causing the problem, i.e. a rare vanilla issue or a specific mod causing the problem, one cannot assume that a mod written for 1.6.2 is actually causing the problem. Until it is proven that this is the case, any assumptions are not appropriate.
I've been running a Minecraft server for a little over two years and five months, and as a modded forge server since last November. At any given point while running forge I've had more than eighty mods on my server, gone through three different Minecraft versions, have had at least half a dozen different restarts during each version, and with each restart at least a dozen different problems to resolve between mods. The fact I'm reaching out to the major modding community at all means I have hit a serious roadblock and a possible core issue is causing a problem. I don't like it when someone answers my questions with a demeaning attitude. I've worked too hard at running a server to deserve that. If I call you a 'know-it-all', you probably deserve it. Please, in the future, consider your choice of words before assisting someone with an issue. How you say them means just as much as the content they convey.