Hey. This might be related to issue #9 but I'm not sure, so my apologies if I should have just commented there. I'm getting a similar error related to a server tick exception and mob spawning, but with no direct mention of MultiMob. It's the only mod that overhauls spawning so I thought this mod might be the cause (note, Epic Siege Mod might also be a conflict).

I got the below crash on my dedicated server running MultiMobLib 1.0.4a and Primitive Mobs 1.2.3a. I hope this helps solve an issue if one exists, and again my apologies if MultiMobLib sin't even the root cause.

crash-2019-01-24_06.24.19-server.txt

Thanks for the report. I am indeed sceptical that this is caused by MM, but I don't know for sure. It does not mention the mod... I don't think I can fix this without a stacktrace referencing my mod, sorry. Did it crash only after installing this mod?

I'm not sure if this is the exact same cause but I am having a similar issue. Server runs ok but eventually crashes from
java.lang.Error: ServerHangWatchdog detected that a single server tick took 62.09 seconds (should be max 0.05)

I think there is a memory leak being caused by multimob since as soon as a player joins the server. This appears
[00:33:44] [Server thread/WARN] [minecraft/EntityDataManager]: defineId called for: class net.daveyx0.multimob.entity.EntityMMBird from class net.daveyx0.multimob.entity.EntityMMFlyingMob

followed by

[00:18:40] [Server thread/WARN] [minecraft/EntityTrackerEntry]: Fetching addPacket for removed entity [00:18:40] [Server thread/WARN] [minecraft/EntityTrackerEntry]: Fetching addPacket for removed entity [00:18:45] [Server thread/WARN] [minecraft/EntityTrackerEntry]: Fetching addPacket for removed entity [00:18:49] [Server thread/WARN] [minecraft/EntityTrackerEntry]: Fetching addPacket for removed entity [00:19:05] [Server thread/WARN] [minecraft/EntityTrackerEntry]: Fetching addPacket for removed entity [00:19:07] [Server thread/WARN] [minecraft/EntityTrackerEntry]: Fetching addPacket for removed entity [00:19:21] [Server thread/WARN] [minecraft/EntityTrackerEntry]: Fetching addPacket for removed entity [00:19:21] [Server thread/WARN] [minecraft/EntityTrackerEntry]: Fetching addPacket for removed entity

Constantly until the server crashes

EDIT: also I've experienced Invisible Trollagers sometimes. Not sure if related

Yeh that last spam is known and is being fixed. I got myself stuck in some reworks again so sorry that it takes so long >,<