Minecraft has crashed

Salut,

j'ai un gros problème avec le launcher d'un serveur que j'ai téléchargé : je peux l'ouvrir, mais quand je me connecte, une barre de chargement incomplète s'affiche avec le texte "détermination des packs à télécharger" pendant quelques secondes, puis l'écran devient noir, et enfin un message d'erreur s'affiche :


Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Failed to start game

A full error report has been saved to /Users/Etienne/Library/Application Support/talvyri/crash-reports/crash-2013-11-09_08.
22.43-client.txt
- Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash :(



--- BEGIN ERROR REPORT 21d3a8de --------
Full report at:
/Users/Etienne/Library/Application Support/talvyri/crash-reports/crash-2013-11-09_08.
22.43-client.txt

Please show that file to Mojang, NOT just this screen!

Generated 09/11/13 08:22

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Mac OS X (x86_64) version 10.9
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 139355704 bytes (132 MB) / 197132288 bytes (188 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 0 total;
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: [com.prupe.mcpatcher.MCPatcherUtils, Config, MCLogger, ...], [com.prupe.mcpatcher.mod.ColorizeItem, AAHelper]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
ModLoader: Mods loaded: 1
ModLoader 1.5.2

LWJGL: 2.4.2
OpenGL: ~~ERROR~~ NullPointerException: null
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null[failed to get system properties (java.lang.NullPointerException)]


org.lwjgl.LWJGLException: Could not get the JAWT interface
at org.lwjgl.opengl.AWTSurfaceLock.lockAndInitHandle(
Native
Method)
at org.lwjgl.opengl.AWTSurfaceLock.access$100(AWTSurf
aceLock.java:49)

at org.lwjgl.opengl.AWTSurfaceLock$1.run(AWTSurfaceLo
ck.java:89)

at java.security.AccessController.doPrivileged(Native

Method)
at org.lwjgl.opengl.AWTSurfaceLock.privilegedLockAndI
nitHandle(AWTSurfaceLock.java:86)

at org.lwjgl.opengl.AWTSurfaceLock.lockAndGetHandle(A
WTSurfaceLock.java:64)

at org.lwjgl.opengl.MacOSXCanvasPeerInfo.initHandle(M
acOSXCanvasPeerInfo.java:53)

at org.lwjgl.opengl.MacOSXDisplayPeerInfo.doLockAndIn
itHandle(MacOSXDisplayPeerInfo.java:56)

at org.lwjgl.opengl.PeerInfo.lockAndGetHandle(PeerInf
o.java:85)

at org.lwjgl.opengl.MacOSXContextImplementation.creat
e(MacOSXContextImplementation.java:47)

at org.lwjgl.opengl.Context.<init>(Context.java:120)


at org.lwjgl.opengl.Display.create(Display.java:858)


at org.lwjgl.opengl.Display.create(Display.java:784)


at org.lwjgl.opengl.Display.create(Display.java:765)



Voilà, il m'est impossible donc d'accéder au serveur. Pourriez-vous m'aider s'il vous plaît ?
( PS : je suis sur mac os x mavericks )