Minecraft Forums

Can anyone assist me here? It says Error while running launchMinecraft(): java.lang.NullPointerException when I attempt to launch it and then it doesn't launch. I checked the mod file and there are the mods

here's the debug version:


FTB Launcher logs:
[21:19:01] [INFO] LaunchFrame.doLogin:719: Logging in...
[21:19:01] [DEBUG] LaunchFrame$15.done:761: responseStr: good
[21:19:01] [INFO] LaunchFrame$15.done:764: Login complete.
[21:19:01] [DEBUG] User.writeObject:168: starting...
[21:19:01] [DEBUG] LaunchFrame$15.done:768: user data saved
[21:19:01] [DEBUG] LaunchFrame.runGameUpdater:812: ForceUpdate: false
[21:19:01] [DEBUG] LaunchFrame.runGameUpdater:813: installPath: E:\Downloads\Ftb
[21:19:01] [DEBUG] LaunchFrame.runGameUpdater:814: pack dir: direwolf20_17
[21:19:01] [DEBUG] LaunchFrame.runGameUpdater:815: pack check path: direwolf20_17\version
[21:19:01] [INFO] MCInstaller.gatherAssets:116: Checking local assets file, for MC version1.7.10 Please wait!
[21:19:01] [DEBUG] MCInstaller.gatherAssets:133: Checking minecraft.jar
[21:19:02] [DEBUG] MCInstaller.gatherAssets:146: checking minecraft libraries
[21:19:02] [DEBUG] MCInstaller.gatherAssets:167: Checking pack libararies
[21:19:02] [DEBUG] MCInstaller.gatherAssets:230: Checking minecraft assets
[21:19:07] [DEBUG] MCInstaller.gatherAssets:245: Starting TaskHandler to check MC assets
[21:19:07] [DEBUG] Benchmark.logBenchAs:71: parallel asset check took 189 ms.
[21:19:07] [INFO] MCInstaller.launchMinecraft:293: Setting up native libraries for Direwolf20 v Recommended Version MC 1.7.10
[21:19:07] [INFO] MCLauncher.syncAssets:258: Syncing Assets:
[21:19:07] [INFO] MCLauncher.launchMinecraft:81: Java Path: C:\Program Files\Java\jre7\bin\javaw.exe
[21:19:07] [INFO] MCLauncher.launchMinecraft:82: Pack: Direwolf20 1.7.10
[21:19:07] [INFO] MCLauncher.setMemory:241: Setting MinMemory to 256
[21:19:07] [INFO] MCLauncher.setMemory:243: Setting MaxMemory to 10240
[21:19:07] [INFO] MCLauncher.launchMinecraft:104: Defaulting PermSize to 256m
[21:19:07] [ERROR] ProcessBuilder.start:-1->MCInstaller.launchMinecraft:409: Error while running launchMinecraft(): java.lang.NullPointerException
java.lang.ProcessBuilder.start(Unknown Source)
net.ftb.minecraft.MCLauncher.launchMinecraft(MCLauncher.java:232)
net.ftb.minecraft.MCInstaller.launchMinecraft(MCInstaller.java:364)
net.ftb.minecraft.MCInstaller.setupNewStyle(MCInstaller.java:103)
net.ftb.gui.LaunchFrame.runGameUpdater(LaunchFrame.java:852)
net.ftb.gui.LaunchFrame.access$800(LaunchFrame.java:99)
net.ftb.gui.LaunchFrame$15.done(LaunchFrame.java:772)
javax.swing.SwingWorker$5.run(Unknown Source)
javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.run(Unknown Source)
sun.swing.AccumulativeRunnable.run(Unknown Source)
javax.swing.SwingWorker$DoSubmitAccumulativeRunnable.actionPerformed(Unknown Source)
javax.swing.Timer.fireActionPerformed(Unknown Source)
javax.swing.Timer$DoPostEvent.run(Unknown Source)
java.awt.event.InvocationEvent.dispatch(Unknown Source)
java.awt.EventQueue.dispatchEventImpl(Unknown Source)
java.awt.EventQueue.access$200(Unknown Source)
java.awt.EventQueue$3.run(Unknown Source)
java.awt.EventQueue$3.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
java.awt.EventQueue.dispatchEvent(Unknown Source)
java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
java.awt.EventDispatchThread.pumpEvents(Unknown Source)
java.awt.EventDispatchThread.pumpEvents(Unknown Source)
java.awt.EventDispatchThread.run(Unknown Source)
[21:19:08] [DEBUG] Benchmark.logBenchAs:71: UnreadNews Init took 524 ms.

Er, I'm not expert on this but that max memory setting seems a tad too high for current windows limits. An extra zero accidentally added?

Otherwise I'd submit error reports to official Direwolf20 forum for troubleshooting, as it's a relatively new pack:

http://forum.feed-the-beast.com/forum/direwolf20-1-7-10.175/

I'm getting the same error but with a slightly smaller memory setting.

bsp;[23:06:28] [INFO] MCLauncher.setMemory:241: Setting MinMemory to 256
[23:06:28] [INFO] MCLauncher.setMemory:243: Setting MaxMemory to 4096
[23:06:28] [INFO] MCLauncher.launchMinecraft:104: Defaulting PermSize to 256m
[23:06:28] [ERROR] ProcessBuilder.start:-1->MCInstaller.launchMinecraft:409: Error while running launchMinecraft(): java.lang.NullPointerException

bump

I think I have the same problem. Does your minecraft just stop loading when it gets to the mojang logo?