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here is what crash txt files says:Minecraft Crash Report ----
// Uh... Did I do that?

Time: 9/03/14 4:32 PM
Description: Exception in server tick loop

java.lang.NoSuchFieldError: fly
at net.minecraft.network.packet.Packet13PlayerLookMove.<init>(Packet13PlayerLookMove.java:23)
at net.minecraft.network.NetServerHandler.func_72569_a(NetServerHandler.java:424)
at net.minecraft.server.management.ServerConfigurationManager.func_72355_a(ServerConfigurationManager.java:131)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:97)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:677)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:573)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:470)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)


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

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 171825256 bytes (163 MB) / 545914880 bytes (520 MB) up to 954466304 bytes (910 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1024m -XX:MaxPermSize=128m
AABB Pool Size: 2998 (167888 bytes; 0 MB) allocated, 2998 (167888 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 2, tallocated: 62
FML: MCP v7.51 FML v5.2.23.737 Minecraft Forge 7.8.1.737 49 mods loaded, 49 mods active
mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{5.2.23.737} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{7.8.1.737} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{0.8.7.3} [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHFramework{1.5.2.5} [CoFH Framework] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ImmibisMicroblocks{55.0.7} [Immibis's Microblocks] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.5.2.28} [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
PowerCrystalsCore{1.1.6} [PowerCrystals Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHCore{1.5.2.5} [CoFHCore] (CoFHCore-1.5.2.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHWorld{1.5.2.5} [CoFHWorld] (CoFHCore-1.5.2.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GalacticraftCore{0.1.36} [Galacticraft Core] (Galacticraft-1.5.2-a0.1.36.410.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ImmibisMicroblocksInstallCheck{55.0.7} [Immibis's Microblocks (Checks for incorrect installation, ignore this)] (immibis-microblocks-55.0.7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ReiMinimap{v3.3_06 [1.5.2]} [mod_ReiMinimap] ([1.5.2]ReiMinimap_v3.3_06.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded{1.5.1R2.6.4} [MineFactory Reloaded] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AppliedEnergistics{rv11.c} [Applied Energistics] (appeng-rv11-c.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AtomicScience{0.6.2} [Atomic Science] (Atomic_Science_v0.6.2.117.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtrabiomesXL{3.13.4} [ExtrabiomesXL] (ExtrabiomesXL-universal-1.5.2-3.13.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ICBM|Contraption{1.2.1} [ICBM] (ICBM_Contraption_v1.2.1.172.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ICBM|Sentry{1.2.1} [ICBM] (ICBM_Sentry_v1.2.1.172.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ICBM|Explosion{1.2.1} [ICBM] (ICBM_Explosion_v1.2.1.172.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ImmibisCore{55.1.6} [Immibis Core] (immibis-core-55.1.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
inventorytweaks{1.54b} [Inventory Tweaks] (InventoryTweaks-1.54b.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mekanism{5.5.6} [Mekanism] (Mekanism-v5.5.6.bugfix1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MekanismGenerators{5.5.6} [MekanismGenerators] (MekanismGenerators-v5.5.6.bugfix1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MekanismTools{5.5.6} [MekanismTools] (MekanismTools-v5.5.6.bugfix1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MFFS{3.1.0} [Modular Force Field System] (MFFS_v3.1.0.175.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatAppliedEnergistics{1.5.1R2.6.4} [MFR Compat: Applied Energistics] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatAtum{1.5.1R2.6.4} [MFR Compat: Atum] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatBackTools{1.5.1R2.6.4} [MFR Compat: BackTools] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatBiomesOPlenty{1.5.1R2.6.4} [MFR Compat: Biomes O' Plenty] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatChococraft{1.5.1R2.6.4} [MFR Compat: Chococraft] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatExtraBiomes{1.5.1R2.6.4} [MFR Compat: ExtraBiomes] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatForestry{1.5.1R2.6.4} [MFR Compat: Forestry] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatForestryPre{1.5.1R2.6.4} [MFR Compat: Forestry (2)] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatIC2{1.5.1R2.6.4} [MFR Compat: IC2] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatMagicalCrops{1.5.1R2.6.4} [MFR Compat: Magical Crops] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatMystcraft{1.5.1R2.6.4} [MFR Compat: Mystcraft] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatPams{1.5.1R2.6.4} [MFR Compat: Pam's Mods] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatRP2{1.5.1R2.6.4} [MFR Compat: RP2] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatSoulShards{1.5.1R2.6.4} [MFR Compat: SoulShards] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatSufficientBiomes{1.5.1R2.6.4} [MFR Compat: Sufficient Biomes] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MFReloaded|CompatThaumcraft{1.5.1R2.6.4} [MFR Compat: Thaumcraft] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatThermalExpansion{1.5.1R2.6.4} [MFR Compat: Thermal Expansion] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatTwilightForest{1.5.1R2.6.4} [MFR Compat: TwilightForest] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatVanilla{1.5.1R2.6.4} [MFR Compat: Vanilla] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MineFactoryReloaded|CompatXyCraft{1.5.1R2.6.4} [MFR Compat: XyCraft] (MineFactoryReloaded-2.6.4-975.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mmmPowersuits{0.7.0-534} [MachineMuse's Modular Powersuits] (ModularPowersuits-0.7.0-534.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
PowersuitAddons{0.2.3-144} [Andrew2448's Modular Powersuits Addon] (MPSA-0.2.3-144_MPS-531+.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NEIPlugins{1.0.9.3} [NEI Plugins] (NEIPlugins-1.0.9.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 375 (21000 bytes; 0 MB) allocated, 375 (21000 bytes; 0 MB) used
Player Count: 1 / 8; [GCCorePlayerMP['seanmcmillan'/314, l='icbms', x=-14.50, y=92.00, z=253.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'