Minecraft client environment crashing

Here it is.

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 2/20/17 9:18 AM
Description: Rendering screen

java.lang.NoClassDefFoundError: io/netty/bootstrap/ServerBootstrap
    at net.minecraft.network.NetworkSystem.addLocalEndpoint(NetworkSystem.java:117)
    at net.minecraft.client.Minecraft.launchIntegratedServer(Minecraft.java:2230)
    at cpw.mods.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:696)
    at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:186)
    at net.minecraft.client.gui.GuiSelectWorld$List.elementClicked(GuiSelectWorld.java:266)
    at net.minecraft.client.gui.GuiSlot.drawScreen(GuiSlot.java:251)
    at net.minecraft.client.gui.GuiSelectWorld.drawScreen(GuiSelectWorld.java:222)
    at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1137)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1067)
    at net.minecraft.client.Minecraft.run(Minecraft.java:962)
    at net.minecraft.client.main.Main.main(Main.java:164)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    at net.minecraftforge.gradle.GradleStartCommon.launch(Unknown Source)
    at GradleStart.main(Unknown Source)
Caused by: java.lang.ClassNotFoundException: io.netty.bootstrap.ServerBootstrap
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    ... 19 more
Caused by: java.lang.OutOfMemoryError: Java heap space
    at java.lang.StringCoding$StringEncoder.encode(StringCoding.java:232)
    at java.lang.StringCoding.encode(StringCoding.java:272)
    at java.lang.String.getBytes(String.java:946)
    at java.io.UnixFileSystem.canonicalize0(Native Method)
    at java.io.UnixFileSystem.canonicalize(UnixFileSystem.java:157)
    at java.io.File.getCanonicalPath(File.java:559)
    at sun.security.provider.PolicyFile.canonPath(PolicyFile.java:1834)
    at java.io.FilePermission$1.run(FilePermission.java:186)
    at java.io.FilePermission$1.run(FilePermission.java:183)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.io.FilePermission.init(FilePermission.java:183)
    at java.io.FilePermission.<init>(FilePermission.java:249)
    at sun.net.www.protocol.file.FileURLConnection.getPermission(FileURLConnection.jav…
    at sun.net.www.protocol.jar.JarURLConnection.getPermission(JarURLConnection.java:8…
    at sun.misc.URLClassPath.check(URLClassPath.java:411)
    at sun.misc.URLClassPath$JarLoader.checkResource(URLClassPath.java:692)
    at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:775)
    at sun.misc.URLClassPath$JarLoader.findResource(URLClassPath.java:751)
    at sun.misc.URLClassPath.findResource(URLClassPath.java:150)
    at java.net.URLClassLoader$2.run(URLClassLoader.java:385)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findResource(URLClassLoader.java:382)
    at net.minecraft.launchwrapper.LaunchClassLoader.findCodeSourceConnectionFor(LaunchClassLoader.java:255)
    at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:138)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at net.minecraft.network.NetworkSystem.addLocalEndpoint(NetworkSystem.java:117)
    at net.minecraft.client.Minecraft.launchIntegratedServer(Minecraft.java:2230)
    at cpw.mods.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:696)
    at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:186)
    at net.minecraft.client.gui.GuiSelectWorld$List.elementClicked(GuiSelectWorld.java:266)
    at net.minecraft.client.gui.GuiSlot.drawScreen(GuiSlot.java:251)

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

-- Head --
Stacktrace:
    at net.minecraft.network.NetworkSystem.addLocalEndpoint(NetworkSystem.java:117)
    at net.minecraft.client.Minecraft.launchIntegratedServer(Minecraft.java:2230)
    at cpw.mods.fml.client.FMLClientHandler.tryLoadExistingWorld(FMLClientHandler.java:696)
    at net.minecraft.client.gui.GuiSelectWorld.func_146615_e(GuiSelectWorld.java:186)
    at net.minecraft.client.gui.GuiSelectWorld$List.elementClicked(GuiSelectWorld.java:266)
    at net.minecraft.client.gui.GuiSlot.drawScreen(GuiSlot.java:251)
    at net.minecraft.client.gui.GuiSelectWorld.drawScreen(GuiSelectWorld.java:222)

-- Screen render details --
Details:
    Screen name: net.minecraft.client.gui.GuiMainMenu
    Mouse location: Scaled: (178, 111). Absolute: (358, 275)
    Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2
Stacktrace:
    at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1137)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1067)
    at net.minecraft.client.Minecraft.run(Minecraft.java:962)
    at net.minecraft.client.main.Main.main(Main.java:164)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
    at net.minecraftforge.gradle.GradleStartCommon.launch(Unknown Source)
    at GradleStart.main(Unknown Source)

-- System Details --
Details:
    Minecraft Version: 1.7.10
    Operating System: Mac OS X (x86_64) version 10.12.3
    Java Version: 1.6.0_65, Apple Inc.
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
    Memory: 241392 bytes (0 MB) / 129957888 bytes (123 MB) up to 129957888 bytes (123 MB)
    JVM Flags: 0 total; 
    AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
    FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1558 4 mods loaded, 4 mods active
    States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
    UCHIJAA    mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) 
    UCHIJAA    FML{7.10.99.99} [Forge Mod Loader] (forgeSrc-1.7.10-10.13.4.1558-1.7.10.jar) 
    UCHIJAA    Forge{10.13.4.1558} [Minecraft Forge] (forgeSrc-1.7.10-10.13.4.1558-1.7.10.jar) 
    UCHIJAA    TestEnvironmentMod{1.0} [TestEnvironmentMod] (modid-1.0.jar) 
    GL info: ' Vendor: 'Intel Inc.' Version: '2.1 INTEL-10.22.29' Renderer: 'Intel(R) Iris(TM) Pro Graphics 6200'
    Launched Version: 1.7.10
    LWJGL: 2.9.1
    OpenGL: Intel(R) Iris(TM) Pro Graphics 6200 GL version 2.1 INTEL-10.22.29, Intel Inc.
    GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because ARB_framebuffer_object 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)

Someone help plz!