Here is the crash report:
---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 10/10/15 1:19 AM
Description: Unexpected error

java.lang.NoClassDefFoundError: de/sanandrew/core/manpack/util/client/SAPClientUtils
at de.sanandrew.mods.claysoldiers.client.event.RenderStatDisplayOverlay.renderSoldiers(RenderStatDisplayOverlay.java:91)
at de.sanandrew.mods.claysoldiers.client.event.RenderStatDisplayOverlay.renderText(RenderStatDisplayOverlay.java:64)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_41_RenderStatDisplayOverlay_renderText_Text.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at net.minecraftforge.client.GuiIngameForge.renderHUDText(GuiIngameForge.java:699)
at net.minecraftforge.client.GuiIngameForge.func_73830_a(GuiIngameForge.java:155)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1038)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:989)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.ClassNotFoundException: de.sanandrew.core.manpack.util.client.SAPClientUtils
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 17 more
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)
... 19 more

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

-- Head --
Stacktrace:
at de.sanandrew.mods.claysoldiers.client.event.RenderStatDisplayOverlay.renderSoldiers(RenderStatDisplayOverlay.java:91)
at de.sanandrew.mods.claysoldiers.client.event.RenderStatDisplayOverlay.renderText(RenderStatDisplayOverlay.java:64)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_41_RenderStatDisplayOverlay_renderText_Text.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at net.minecraftforge.client.GuiIngameForge.renderHUDText(GuiIngameForge.java:699)
at net.minecraftforge.client.GuiIngameForge.func_73830_a(GuiIngameForge.java:155)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Nukemaker'/53, l='MpServer', x=212.92, y=5.62, z=-164.39]]
Chunk stats: MultiplayerChunkCache: 624, 624
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (366,4,-90), Chunk: (at 14,0,6 in 22,-6; contains blocks 352,0,-96 to 367,255,-81), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 2614 game time, 2614 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 19 total; [EntityHuman['Lyra the Mason'/13, l='MpServer', x=165.50, y=4.00, z=-199.47], EntitySheep['Sheep'/65586, l='MpServer', x=218.50, y=4.00, z=-218.50], EntitySheep['Sheep'/65587, l='MpServer', x=217.50, y=4.00, z=-216.50], EntitySheep['Sheep'/65584, l='MpServer', x=224.50, y=4.00, z=-217.50], EntitySheep['Sheep'/65585, l='MpServer', x=221.50, y=4.00, z=-221.50], EntitySheep['Sheep'/65590, l='MpServer', x=215.91, y=4.00, z=-222.50], EntitySheep['Sheep'/65591, l='MpServer', x=207.22, y=4.00, z=-230.31], EntitySheep['Sheep'/65588, l='MpServer', x=210.03, y=4.00, z=-213.94], EntitySheep['Sheep'/65589, l='MpServer', x=217.22, y=4.00, z=-222.69], EntityClientPlayerMP['Nukemaker'/53, l='MpServer', x=212.92, y=5.62, z=-164.39], EntityCow['Cow'/65583, l='MpServer', x=223.50, y=4.00, z=-213.50], EntityCow['Cow'/65582, l='MpServer', x=225.50, y=4.00, z=-215.50], EntityCow['Cow'/65581, l='MpServer', x=222.50, y=4.00, z=-219.50], EntityCow['Cow'/65580, l='MpServer', x=222.50, y=4.00, z=-216.50], EntityCow['Cow'/65624, l='MpServer', x=215.50, y=4.00, z=-85.50], EntityCow['Cow'/65625, l='MpServer', x=217.50, y=4.00, z=-85.50], EntityHuman['Cam the Weaponsmith'/62804, l='MpServer', x=164.61, y=4.00, z=-192.38], EntityHuman['Daire the Fisherman'/62810, l='MpServer', x=164.69, y=4.00, z=-194.44], EntityHuman['Zed the Butcher'/43522, l='MpServer', x=164.41, y=4.00, z=-206.16]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2432)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:916)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_71, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 897633976 bytes (856 MB) / 1056309248 bytes (1007 MB) up to 1593180160 bytes (1519 MB)
JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -XX:-OmitStackTraceInFastThrow -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xms1024M -Xmx1536M -XX:PermSize=256M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.85.1291 Minecraft Forge 10.13.2.1291 8 mods loaded, 8 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1291} Forge Mod Loader Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1291} Minecraft Forge Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
sapmanpack{2.5.1} SanAndreasPs Manager Pack CORE edition Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
claysoldiers{2.0.0b} Clay Soldiers Mod Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
RadixCore{2.0.2} RadixCore Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MCA{5.0.6} Minecraft Comes Alive Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
WebDisplay{0.10} Web Displays Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.7.10
LWJGL: 2.9.1
OpenGL: GeForce 8400GS/PCI/SSE2 GL version 3.3.0, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

Please Help!

Please use gist or pastebin next time (though changing this to a gist or pastebin would be much appreciated), also could you tell use what item(s) you had in hand, that would be very helpful.

i was holding a clay man specify 1 blue clay soldier (i also did it with red and the normal grey)

You are not supposed to see this :)

I'll now close most issues in here for now, since I need to recode everything again for 1.10 / 1.11 anyway.