launcher would hang while downloading Tekkit

[hyper1on]

Launcher Version: 253

Operating System: win7 64bit

Java Version: 1.6

Antivirus Program: AVG

Description of Problem:

I was trying to download Tekkit (NOT classic or lite) and it kept hanging at downloading Simple Power Storage. I was able to download and play big dig and hack/slash. I tried resetting the pack several times. I finally got it to work by deleting the cache folder and the tekkitmain folder. The launcher redownloaded everything and it works fine now. This may be something that would be good to add to the Common solutions sticky.

Error Messages:

None.

Error Log:

[iNFO] Mod simplepowerstorage-v1.0.10.zip already found in the cache.

2013/09/22 19:57:26 [iNFO] Expected MD5: 00103d5ab91510ed9e0d0213b6321a57 Calculated MD5: 00103d5ab91510ed9e0d0213b6321a57

2013/09/22 19:57:26 [iNFO] Succesfully skipped download of: simplepowerstorage v1.0.10

2013/09/22 19:57:27 [iNFO] Preloaded 0 classes in advance

2013/09/22 19:57:27 [sEVERE] org.spoutcraft.launcher.exceptions.UnknownMinecraftException

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftLauncher.getMinecraftApplet(MinecraftLauncher.java:99)

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.GameLauncher.runGame(GameLauncher.java:133)

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.GameUpdater.runGame(GameUpdater.java:81)

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.skin.LoginFrame.onEvent(LoginFrame.java:300)

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.skin.LoginWorker.doInBackground(LoginWorker.java:102)

2013/09/22 19:57:27 [sEVERE] 	at org.jdesktop.swingworker.SwingWorker$1.call(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at java.util.concurrent.FutureTask.run(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at org.jdesktop.swingworker.SwingWorker.run(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at java.lang.Thread.run(Unknown Source)

2013/09/22 19:57:27 [sEVERE] Caused by: java.lang.IncompatibleClassChangeError: Implementing class

2013/09/22 19:57:27 [sEVERE] 	at java.lang.ClassLoader.defineClass1(Native Method)

2013/09/22 19:57:27 [sEVERE] 	at java.lang.ClassLoader.defineClassCond(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at java.lang.ClassLoader.defineClass(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at java.security.SecureClassLoader.defineClass(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftClassLoader.findClassInjar(MinecraftClassLoader.java:169)

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftClassLoader.findClass(MinecraftClassLoader.java:143)

2013/09/22 19:57:27 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftLauncher.setMinecraftDirectory(MinecraftLauncher.java:110)

2013/09/22 19:57:27 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftLauncher.getMinecraftApplet(MinecraftLauncher.java:86)

2013/09/22 19:57:27 [sEVERE]