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Here is the error:

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 8/30/15 4:03 PM
Description: Stitching texture atlas

java.lang.NullPointerException: Stitching texture atlas
at shadersmodcore.client.ShadersTex.readImage(ShadersTex.java:464)
at shadersmodcore.client.ShadersTex.readImageAndMipmaps(ShadersTex.java:439)
at shadersmodcore.client.ShadersTex.uploadTexSubForLoadAtlas(ShadersTex.java:419)
at net.minecraft.client.renderer.texture.TextureMap.func_110571_b(TextureMap.java:381)
at net.minecraft.client.renderer.texture.TextureMap.func_110551_a(TextureMap.java:136)
at net.minecraft.client.renderer.texture.TextureManager.func_110579_a(TextureManager.java:94)
at net.minecraft.client.renderer.texture.TextureManager.func_110580_a(TextureManager.java:76)
at net.minecraft.client.renderer.texture.TextureManager.func_130088_a(TextureManager.java:63)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:545)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Stacktrace:
at shadersmodcore.client.ShadersTex.readImage(ShadersTex.java:464)
at shadersmodcore.client.ShadersTex.readImageAndMipmaps(ShadersTex.java:439)
at shadersmodcore.client.ShadersTex.uploadTexSubForLoadAtlas(ShadersTex.java:419)

-- Texture being stitched together --
Details:
Atlas path: textures/blocks
Sprite: TextureAtlasSprite{name='missingno', frameCount=1, rotated=false, x=0, y=0, height=16, width=16, u0=6.25E-4, u1=0.999375, v0=6.25E-4, v1=0.999375}
Stacktrace:
at net.minecraft.client.renderer.texture.TextureMap.func_110571_b(TextureMap.java:381)
at net.minecraft.client.renderer.texture.TextureMap.func_110551_a(TextureMap.java:136)

-- Resource location being registered --
Details:
Resource location: minecraft:textures/atlas/blocks.png
Texture object class: net.minecraft.client.renderer.texture.TextureMap
Stacktrace:
at net.minecraft.client.renderer.texture.TextureManager.func_110579_a(TextureManager.java:94)
at net.minecraft.client.renderer.texture.TextureManager.func_110580_a(TextureManager.java:76)
at net.minecraft.client.renderer.texture.TextureManager.func_130088_a(TextureManager.java:63)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:545)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:878)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
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: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 239900920 bytes (228 MB) / 771227648 bytes (735 MB) up to 3817865216 bytes (3641 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G
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 v7.10.99.99 Minecraft Forge 10.13.4.1492 Optifine OptiFine_1.7.10_HD_U_C1 3 mods loaded, 3 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCH mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCH FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1492-1.7.10.jar)
UCH Forge{10.13.4.1492} [Minecraft Forge] (forge-1.7.10-10.13.4.1492-1.7.10.jar)
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 355.60' Renderer: 'GeForce GT 720/PCIe/SSE2'
Launched Version: 1.7.10-Forge10.13.4.1492-1.7.10
LWJGL: 2.9.1
OpenGL: GeForce GT 720/PCIe/SSE2 GL version 4.5.0 NVIDIA 355.60, 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)

Wrong section.

But seems like some block's atlas got corrupted.

Also,this made me laugh

Sprite: TextureAtlasSprite{name='missingno', frameCount=1,
rotated=false, x=0, y=0, height=16, width=16, u0=6.25E-4, u1=0.999375,
v0=6.25E-4, v1=0.999375}

It helps to read mod installation instructions.

For Minecraft 1.7.10
- Shaders Mod v2.3.28 Forge Edition for Minecraft 1.7.10 (2014-10-03) (link)
Download shadersmod.net
Compatible with Minecraft 1.7.10.
Compatible with OptiFine_1.7.10_HD_U_A4. (only ultra edition)
Compatible with AMD Catalyst 14.9.
Requires Forge or FML. You can download Forge installer from files.minecraftforge.net.
It can be used with Forge v10.13.4.1448 but not with latest version.
Use Forge installer to install Forge. Select Forge Profile in Minecraft Launcher.
Copy ShadersMod jar file to mods folder in game directory, so it will be loaded by Forge.