Trouble initializing game

Minecraft Crash Report ----
// Shall we play a game?

Time: 3/8/15 5:57 PM
Description: Initializing game

java.lang.OutOfMemoryError: Java heap space
at bmj.a(SourceFile:363)
at bmj.a(SourceFile:255)
at bmi.b(SourceFile:130)
at bmi.a(SourceFile:77)
at bou.j(SourceFile:553)
at bou.a(SourceFile:139)
at bov.a(SourceFile:23)
at bno.a(SourceFile:99)
at avf.am(SourceFile:448)
at avf.a(SourceFile:310)
at net.minecraft.client.main.Main.main(SourceFile:124)

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

– Head –
Stacktrace:
at bmj.a(SourceFile:363)
at bmj.a(SourceFile:255)
at bmi.b(SourceFile:130)
at bmi.a(SourceFile:77)
at bou.j(SourceFile:553)
at bou.a(SourceFile:139)
at bov.a(SourceFile:23)
at bno.a(SourceFile:99)
at avf.am(SourceFile:448)

– Initialization –
Details:
Stacktrace:
at avf.a(SourceFile:310)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.8.3
Operating System: Windows 7 (amd64) version 6.1
CPU: 8x Intel(R) Core(TM) i7-2670QM CPU @ 2.20GHz
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 68744304 bytes (65 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8.3
LWJGL: 2.9.4
OpenGL: Radeon (TM) HD 7690M XT GL version 4.1.11013 Compatibility Profile Context, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [Sphax PureBDcraft 512x MC17 (1).zip]
Current Language: English (US)
Profiler Position: N/A (disabled)