After I followed the instruction on the FAQ about fixing "Oops a download error occured", it had a new problem.
Here's the log:
Getting assets from: https://s3.amazonaws.com/8BitMMO/
Will connect to: core.8bitmmo.net:1337
Ready to go?: true
We will store to:C:\Documents and Settings\Nguyen Duy Minh\Application Data\8BitMMO\Clients\2f4a8472\
Accessing s3.amazonaws.com/8BitMMO/version.txt
Client is up to date.
OUTPUT>componentResized
OUTPUT>new size: 1028x720
ERROR>Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
ERROR> at pulpcore.player.PulpCorePlayer.handleResize(PulpCorePlayer.java:482)
ERROR> at pulpcore.player.PulpCorePlayer$3.componentResized(PulpCorePlayer.java:463)
ERROR> at java.awt.Component.processComponentEvent(Component.java:6331)
ERROR> at java.awt.Component.processEvent(Component.java:6285)
ERROR> at java.awt.Container.processEvent(Container.java:2229)
ERROR> at java.awt.Component.dispatchEventImpl(Component.java:4861)
ERROR> at java.awt.Container.dispatchEventImpl(Container.java:2287)
ERROR> at java.awt.Component.dispatchEvent(Component.java:4687)
ERROR> at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
ERROR> at java.awt.EventQueue.access$200(EventQueue.java:103)
ERROR> at java.awt.EventQueue$3.run(EventQueue.java:694)
ERROR> at java.awt.EventQueue$3.run(EventQueue.java:692)
ERROR> at java.security.AccessController.doPrivileged(Native Method)
ERROR> at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
ERROR> at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
ERROR> at java.awt.EventQueue$4.run(EventQueue.java:708)
ERROR> at java.awt.EventQueue$4.run(EventQueue.java:706)
ERROR> at java.security.AccessController.doPrivileged(Native Method)
ERROR> at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
ERROR> at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
ERROR> at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
ERROR> at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
ERROR> at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
ERROR> at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
ERROR> at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
ERROR> at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
ERROR>java.lang.ClassNotFoundException: pulpcore.platform.applet.CoreApplet
ERROR> at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
ERROR> at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
ERROR> at java.security.AccessController.doPrivileged(Native Method)
ERROR> at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
ERROR> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
ERROR> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
ERROR> at pulpcore.player.PulpCorePlayer.loadApplet(PulpCorePlayer.java:631)
ERROR> at pulpcore.player.PulpCorePlayer.access$300(PulpCorePlayer.java:95)
ERROR> at pulpcore.player.PulpCorePlayer$4.run(PulpCorePlayer.java:605)
ERROR> at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
ERROR> at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
ERROR> at java.awt.EventQueue.access$200(EventQueue.java:103)
ERROR> at java.awt.EventQueue$3.run(EventQueue.java:694)
ERROR> at java.awt.EventQueue$3.run(EventQueue.java:692)
ERROR> at java.security.AccessController.doPrivileged(Native Method)
ERROR> at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
ERROR> at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
ERROR> at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
ERROR> at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
ERROR> at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
ERROR> at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
ERROR> at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
ERROR> at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Setting breakpad minidump AppID = 250420
Steam_SetMinidumpSteamID: Caching Steam ID: 76561198185220478 [API loaded no]