[Server thread/WARN]: ****************************************
[Server thread/WARN]: * Failed attempt to create a FluidStack for an unregistered Fluid  (type net.minecraftforge.fluids.Fluid)
[Server thread/WARN]: *  at net.minecraftforge.fluids.FluidStack.<init>(FluidStack.java:54)
[Server thread/WARN]: *  at sun.reflect.GeneratedConstructorAccessor1001.newInstance(Unknown Source)
[Server thread/WARN]: *  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
[Server thread/WARN]: *  at java.lang.reflect.Constructor.newInstance(Unknown Source)
[Server thread/WARN]: *  at com.comphenix.protocol.reflect.instances.DefaultInstances.createInstance(DefaultInstances.java:332)
[Server thread/WARN]: *  at com.comphenix.protocol.reflect.instances.DefaultInstances.getDefaultInternal(DefaultInstances.java:292)...
[Server thread/WARN]: *

请发送完整log日志

日志中显示的还是这个

有未知的流体，是mod导致的，你看看有什么mod加了流体，一一去排除