[Question]: What could be causing this?

[silasclockwork]

Question

Hi, so I have been putting a server together, with the use of your mod. I am experiencing a constant error in the console, and I am wondering what you think might be causing this, or at least a better idea of what the error means. I tried going to your Discord to ask, so as not to muddy up the github with it, but the link is broken and I can't find it any with any other method. I will attach a txt file with the error. It basically happens anytime someone joins, leaves, or at random. Tried Googling to no avail. Any help would be appreciated.
DCI-Weirdness.txt