При входе в игру(один раз получилось войти, второй и далее - нет)выдает эту ошибку:

-- BEGIN ERROR REPORT a1dce528 --------
Generated 24.04.12 16:26

Minecraft: Minecraft Beta 1.7.2
OS: Windows 7 (x86) version 6.1
Java: 1.6.0_31, Sun Microsystems Inc.
VM: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: null version null, null

java.lang.IllegalStateException: glGetString(GL_VERSION) returned null - possibly caused by missing current context.
at org.lwjgl.opengl.GLContext.getSupportedExtensions(GLContext.java:187)
at org.lwjgl.opengl.ContextCapabilities.initAllStubs(ContextCapabilities.java:4355)
at org.lwjgl.opengl.ContextCapabilities.‹init›(ContextCapabilities.java:4661)
at org.lwjgl.opengl.GLContext.useContext(GLContext.java:352)
at org.lwjgl.opengl.Context.makeCurrent(Context.java:183)
at org.lwjgl.opengl.Display.makeCurrent(Display.java:730)
at org.lwjgl.opengl.Display.makeCurrentAndSetSwapInterval(Display.java:896)
at org.lwjgl.opengl.Display.create(Display.java:860)
at org.lwjgl.opengl.Display.create(Display.java:784)
at net.minecraft.client.Minecraft.startGame(Minecraft.java:169)
at net.minecraft.client.Minecraft.run(Minecraft.java:514)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 27e01e9f ----------