1. Broke npc. Look at server start how many npc you broke, or maybe only one 21378
2. That is report about AI cast of Mdam, looks like on cast AI, player or npc or summon disappearing (that is ok, just report)
you have nothing serious in the logs. This does not affect the operation of the server. The only thing is that if you break the file from the data/npc , some of the mobs and NPCs will not appear in the world