I installed the mod a week ago and have been plagued with random crashes which eventually result in my saved games being corrupted and lost. I am extremely frustrated because ive made no progress at all in the week ive been playing. Ive reinstalled minecraft, tfc, forge, and java multiple times and im still crashing. It seems to happen when im walking around exploring, probably from an object loading, I don’t think its ever happened when im just sitting in one spot like in my hut. Here is my latest crash log, which is my only surviving crash log since I forgot to save them during reinstalls. Im sure I will have new crash logs to compare since I continue to try to make this awesome mod work for me. I wont give up, please help! ---- Minecraft Crash Report ----// Ouch. That hurt Time: 11/4/13 5:49 PMDescription: Exception ticking worldjava.lang.NoClassDefFoundError: net/minecraft/world/CallableLvl1 at net.minecraft.world.World.func_72821_m(World.java:862) at net.minecraft.world.World.func_72898_h(World.java:789) at net.minecraft.world.World.func_72851_f(World.java:741) at net.minecraft.world.World.func_72832_d(World.java:573) at net.minecraft.world.World.func_94575_c(World.java:721) at TFC.Blocks.BlockLogNatural.func_71847_b(BlockLogNatural.java:43) at net.minecraft.world.WorldServer.func_72893_g(WorldServer.java:442) at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:201) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:655) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:585) at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482) at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:582)A detailed walkthrough of the error, its code path and all known details is as follows:----------------------------------------------------------------------------------------- Head --Stacktrace: at net.minecraft.world.World.func_72821_m(World.java:862) at net.minecraft.world.World.func_72898_h(World.java:789) at net.minecraft.world.World.func_72851_f(World.java:741) at net.minecraft.world.World.func_72832_d(World.java:573) at net.minecraft.world.World.func_94575_c(World.java:721) at TFC.Blocks.BlockLogNatural.func_71847_b(BlockLogNatural.java:43) at net.minecraft.world.WorldServer.func_72893_g(WorldServer.java:442) at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:201)-- Affected level --Details: Level name: Narg All players: 1 total; [EntityPlayerMP['NameHidden'/3, l='Narg', x=2917.78, y=144.00, z=-10369.62]] Chunk stats: ServerChunkCache: 1399 Drop: 0 Level seed: 1484982327068802084 Level generator: ID 00 - DEFAULT, ver 1. Features enabled: false Level generator options: Level spawn location: World: (68,145,256), Chunk: (at 4,9,0 in 4,16; contains blocks 64,0,256 to 79,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511) Level time: 87615 game time, 87615 day time Level dimension: 0 Level storage version: 0x04ABD - Anvil Level weather: Rain time: 69940 (now: false), thunder time: 91418 (now: false) Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: falseStacktrace: at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:655) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:585) at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482) at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:582)-- System Details --Details: Minecraft Version: 1.6.2 Operating System: Windows 7 (amd64) version 6.1 Java Version: 1.7.0_05, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 570477904 bytes (544 MB) / 2060451840 bytes (1965 MB) up to 3817799680 bytes (3640 MB) JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -Xms2G AABB Pool Size: 1972 (110432 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used Suspicious classes: FML and Forge are installed IntCache: cache: 0, tcache: 16, allocated: 1, tallocated: 31 FML: MCP v8.04 FML v6.2.62.871 Minecraft Forge 9.10.1.871 4 mods loaded, 4 mods active mcp{8.04} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available FML{6.2.62.871} [Forge Mod Loader] (minecraftforge-9.10.1.871.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available Forge{9.10.1.871} [Minecraft Forge] (minecraftforge-9.10.1.871.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available terrafirmacraft{0.77.21} [TerraFirmaCraft] (TFC-0.77.21.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available Profiler Position: N/A (disabled) Vec3 Pool Size: 1853 (103768 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used Player Count: 1 / 8; [EntityPlayerMP['NameHidden'/3, l='Narg', x=2917.78, y=144.00, z=-10369.62]] Type: Integrated Server (map_client.txt) Is Modded: Definitely; Client brand changed to 'fml,forge'