警告 Wrong location for EntityPhantomSwordBase['entity.flammpfeil.slashblade.PhantomSwordBase.name'/90, l='world', x=NaN, y=NaN, z=NaN] in world 'world'!11.12 20:29:16 [服务器] 警告 Entity is at NaN,NaN (chunk 0,0) but was stored in chunk -11,1811.12 20:29:16 [服务器] 警告 Cauldron has removed EntityPhantomSwordBase['entity.flammpfeil.slashblade.PhantomSwordBase.name'/90, l='world', x=NaN, y=NaN, z=NaN] to prevent a server crash.11.12 20:29:16 [服务器] 警告 Wrong location for EntityPhantomSwordBase['entity.flammpfeil.slashblade.PhantomSwordBase.name'/91, l='world', x=NaN, y=NaN, z=NaN] in world 'world'!11.12 20:29:16 [服务器] 警告 Entity is at NaN,NaN (chunk 0,0) but was stored in chunk -11,1811.12 20:29:16 [服务器] 警告 Cauldron has removed EntityPhantomSwordBase['entity.flammpfeil.slashblade.PhantomSwordBase.name'/91, l='world', x=NaN, y=NaN, z=NaN] to prevent a server crash.11.12 20:29:16 [服务器] 警告 Wrong location for EntityPhantomSwordBase['entity.flammpfeil.slashblade.PhantomSwordBase.name'/92, l='world', x=NaN, y=NaN, z=NaN] in world 'world'!11.12 20:29:16 [服务器] 警告 Entity is at NaN,NaN (chunk 0,0) but was stored in chunk -11,1811.12 20:29:16 [服务器] 警告 Cauldron has removed EntityPhantomSwordBase['entity.flammpfeil.slashblade.PhantomSwordBase.name'/92, l='world', x=NaN, y=NaN, z=NaN] to prevent a server crash.11.12 20:29:16 [服务器] 警告 Wrong location for EntityPhantomSwordBase['entity.flammpfeil.slashblade.PhantomSwordBase.name'/100, l='world', x=-Infinity, y=-Infinity, z=Infinity] in world 'world'!

将config目录下的forge.cfg文件内：
removeErroringEntities=false 改为 removeErroringEntities=true
removeErroringTileEntities=false 改为 removeErroringTileEntities=true

依旧如此

楼主您好，你这个错误是拔刀剑导致的，目前最简单的解决办法是可以把拔刀剑mod的版本换成r77！如果楼主会删区块实体的话，直接把名为“”flammpfeil.slashblade”的删掉也可以正常运行！如果还有疑问可咨询本人QQ1404844990，（因为我是学生党，没有太多时间来帖子回复）