People constantly getting 'Internal Server Error' [PlotMe]

Hello! So, my current issue is that when a user types /p home (or /p home:#) they crash with an internal server error. This has happened with several people. However, there are a bit more specific things. First of all, for some people, it might just be /p home:3, and /p home:2 will work just fine. Second of all, if I teleport to the coordinates of the plot, I do not crash. (I, because I am the only one with /tppos). Third of all, if you were to dispose(disown) a plot, your plot numbers would change. So, the old plot 3 would become plot 2. However, If /p home:3 crashed you before, and your plot rotation switched, /p home:3 would still be the cause of the crash. Last of all, I have tried removed the r.x.x.mca files from the Creative(plotme world) directory. That has not worked.

I have contacted the developer through the ticket system, but that was about a month ago and the errors are becoming more frequent.

Console log: (I am using Spigot) http://pastebin.com/Bw81zXfM (read bttom -> top)

If that was confusing (which it probably was) ask me questions! I want to try my best with the help of others to get this issue resolved. Thanks!