java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_291]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_291]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:846) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:467) [nz.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:630) [MinecraftServer.class:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_291]
Caused by: java.lang.NullPointerException
at net.minecraft.world.World.handler$zzf000$checkLightFor(World.java:4636) ~[amu.class:?]
at net.minecraft.world.World.func_180500_c(World.java) ~[amu.class:?]
at net.minecraft.world.World.func_175664_x(World.java:3222) ~[amu.class:?]
at com.creativemd.littletiles.common.tileentity.TileEntityLittleTiles.updateLighting(TileEntityLittleTiles.java:178) ~[TileEntityLittleTiles.class:?]
at com.creativemd.littletiles.common.tileentity.TileEntityLittleTiles.updateTiles(TileEntityLittleTiles.java:261) ~[TileEntityLittleTiles.class:?]
at com.creativemd.littletiles.common.util.place.Placement.placeTiles(Placement.java:237) ~[Placement.class:?]
at com.creativemd.littletiles.common.util.place.Placement.place(Placement.java:178) ~[Placement.class:?]
at com.creativemd.littletiles.common.util.place.Placement.tryPlace(Placement.java:189) ~[Placement.class:?]
at com.creativemd.littletiles.common.structure.type.door.LittleDoorBase.place(LittleDoorBase.java:206) ~[LittleDoorBase.class:?]
at com.creativemd.littletiles.common.structure.type.door.LittleDoorBase.openDoor(LittleDoorBase.java:265) ~[LittleDoorBase.class:?]
at com.creativemd.littletiles.common.structure.type.door.LittleDoor.activate(LittleDoor.java:106) ~[LittleDoor.class:?]
at com.creativemd.littletiles.common.packet.LittleActivateDoorPacket.executeServer(LittleActivateDoorPacket.java:87) ~[LittleActivateDoorPacket.class:?]
at com.creativemd.creativecore.common.packet.PacketReciever$2.run(PacketReciever.java:117) ~[PacketReciever$2.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_291]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_291]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
... 5 more

    door after opening stop working and become non existing block 
    
    mods: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],spartanweaponry@beta 1.3.8,[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]

Can you send me your entire log file?

2021-06-07-1.log

LittleTiles does not support Mohist. The issue is very likely to come from that. You could report it to them, maybe the can fix it or already have fixed it in an update.