I have this crashlog, All is working in 7.1.9.
I notice that the problem is not present on new world. There is a strange thing on the crashlog : A entity is under y= -46000.

Sorry for this ugly text, I can't join it.

Thanks for all

---- Minecraft Crash Report ----
// My bad.

Time: 23/10/15 22:23
Description: Ticking entity

java.lang.IndexOutOfBoundsException: bitIndex < 0: -774741
at java.util.BitSet.get(BitSet.java:623)
at buildcraft.core.properties.ChunkProperty.get(ChunkProperty.java:31)
at buildcraft.core.properties.DimensionProperty.get(DimensionProperty.java:49)
at buildcraft.core.properties.WorldProperty.get(WorldProperty.java:25)
at buildcraft.api.core.BuildCraftAPI.isSoftBlock(BuildCraftAPI.java:54)
at buildcraft.robotics.EntityRobot.func_70030_z(EntityRobot.java:364)
at net.minecraft.entity.Entity.func_70071_h_(Entity.java:318)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1561)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)
at net.minecraft.world.World.func_72870_g(World.java:2034)
at WorldServerOF.func_72870_g(WorldServerOF.java:347)
at net.minecraft.world.World.func_72939_s(World.java:1887)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Stacktrace:
at java.util.BitSet.get(BitSet.java:623)
at buildcraft.core.properties.ChunkProperty.get(ChunkProperty.java:31)
at buildcraft.core.properties.DimensionProperty.get(DimensionProperty.java:49)
at buildcraft.core.properties.WorldProperty.get(WorldProperty.java:25)
at buildcraft.api.core.BuildCraftAPI.isSoftBlock(BuildCraftAPI.java:54)
at buildcraft.robotics.EntityRobot.func_70030_z(EntityRobot.java:364)
at net.minecraft.entity.Entity.func_70071_h_(Entity.java:318)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1561)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:206)
at net.minecraft.world.World.func_72866_a(World.java:2070)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:648)
at net.minecraft.world.World.func_72870_g(World.java:2034)
at WorldServerOF.func_72870_g(WorldServerOF.java:347)

-- Entity being ticked --
Details:
Entity Type: BuildCraft|Robotics.bcRobot (buildcraft.robotics.EntityRobot)
Entity ID: 149
Entity Name: Robot
Entity's Exact location: -1183,50, -48421,03, 4683,50
Entity's Block location: World: (-1184,-48422,4683), Chunk: (at 0,-3027,11 in -74,292; contains blocks -1184,0,4672 to -1169,255,4687), Region: (-3,9; contains chunks -96,288 to -65,319, blocks -1536,0,4608 to -1025,255,5119)
Entity's Momentum: 0,00, -0,08, 0,00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1887)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)

-- Affected level --
Details:
Level name: Moi et Clarisse
All players: 0 total; []
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: -5660933991790455267
Level generator: ID 02 - largeBiomes, ver 0. Features enabled: true
Level generator options:
Level spawn location: World: (-1170,62,4739), Chunk: (at 14,3,3 in -74,296; contains blocks -1184,0,4736 to -1169,255,4751), Region: (-3,9; contains chunks -96,288 to -65,319, blocks -1536,0,4608 to -1025,255,5119)
Level time: 4277975 game time, 5353305 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 133866 (now: false), thunder time: 35225 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 320059912 bytes (305 MB) / 597954560 bytes (570 MB) up to 3179282432 bytes (3032 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn400M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 104
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1448 Optifine OptiFine_1.7.10_HD_U_B8 17 mods loaded, 17 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.05} Minecraft Coder Pack
UCHIJAAAA FML{7.10.99.99} Forge Mod Loader
UCHIJAAAA Forge{10.13.4.1448} Minecraft Forge
UCHIJAAAA BuildCraft|Core{7.1.11} BuildCraft
UCHIJAAAA BuildCraft|Builders{7.1.11} BC Builders
UCHIJAAAA BuildCraft|Transport{7.1.11} BC Transport
UCHIJAAAA BuildCraft|Energy{7.1.11} BC Energy
UCHIJAAAA BuildCraft|Silicon{7.1.11} BC Silicon
UCHIJAAAA BuildCraft|Robotics{7.1.11} BC Robotics
UCHIJAAAA BuildCraft|Factory{7.1.11} BC Factory
UCHIJAAAA BuildMod{v1.0} Build Mod
UCHIJAAAA CoroAI{v1.0} CoroAI
UCHIJAAAA ExtendedRenderer{v1.0} Extended Renderer
UCHIJAAAA ConfigMod{v1.0} Extended Mod Config
UCHIJAAAA craftguide{1.6.8.2} CraftGuide
UCHIJAAAA exoticbirds{1.0} [Exotic Birds](Exotic Birds for 1.7.10 by Pavocado.jar)
UCHIJAAAA ZAMod{v1.9.5} Zombie Awareness
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

@dj3520 Thank you for your answer, But It still works in Buildcraft 7.1.9, When I downgrade to this version I can play without problems.
I will investigate this idea if I have no solution.
Sorry for my english.

the best fix for this would probably be to teleport a robot to it's home station or to max world height and dead so the robot lands on solid ground for it's owner to pick it up

Good idea but can you explain me how to do this miracle ?
I tried McEDIT, it does not work.

@FinalPast that was mainly ment for @asiekierka it's something to be done from the mod code, i don't know if McEdit can do it or not, never tried it.

You could also set the forge config option 'remove erroring entities' temporarily to true

Am 23.10.2015 um 23:19 schrieb FinalPast [email protected]:

@dj3520 Thank you for your answer, But It still works in Buildcraft 7.1.9, When I downgrade to this version I can play without problems.
I will investigate this idea if I have no solution.
Sorry for my english.

—
Reply to this email directly or view it on GitHub.

@iTitus 👍 You are absolutely right. It's working !
I close this issue, Thank you a lot.

EDIT: It is working but I can't turn it false again, and my cows are just crazy with this option.

Why can't you turn it off?

If I do that, It crash again :/