Mon minecraft modée crash

Bonjour,un ami crée un launcher modée et quand je le lance il crash
voila les logs:
# NoName Launcher Crash Report

#

# At : 2017/01/29 22:29:23

#

# Exception : LaunchException


# fr.theshark34.openlauncherlib.LaunchException: Invoked method returned an exception

# fr.theshark34.openlauncherlib.internal.InternalLauncher.launch(InternalLauncher.java:176)

# be.nartyre.noname.launcher.Launcher.launch(Launcher.java:87)

# be.nartyre.noname.launcher.LauncherPanel$1.run(LauncherPanel.java:109)

# Caused by: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException

# net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)

# java.lang.SecurityManager.checkExit(Unknown Source)

# java.lang.Runtime.exit(Unknown Source)

# java.lang.System.exit(Unknown Source)

# net.minecraft.launchwrapper.Launch.launch(Launch.java:138)

# net.minecraft.launchwrapper.Launch.main(Launch.java:28)

# sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

# sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

# sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

# java.lang.reflect.Method.invoke(Unknown Source)

# fr.theshark34.openlauncherlib.internal.InternalLauncher.launch(InternalLauncher.java:166)

# be.nartyre.noname.launcher.Launcher.launch(Launcher.java:87)

# be.nartyre.noname.launcher.LauncherPanel$1.run(LauncherPanel.java:109)

Merci d'avance pour l'aide :)