No updates found for tekkitmain

[yorkshirerocket]

Launcher Version: 253 Beta

Operating System: Win 7 64x

Java Version: 1.7.0_25-b17

Antivirus Program: Malwarebytes

Description of Problem:

I've seen this a couple of times but I haven't found a conclusive fix.

Essentially, I try to run Tekkit, the update bar says '100% no updates found for tekkitmain', and nothing else happens. It still says 'launching...' on the launch button but it doesn't launch.

I've found that, if I uninstall and re-download; reset the pack; or otherwise re-download and install all the necessary files like in initial startup, then it will launch that once but will require the same process on each launch. My main problem with this, other than the time it entails, is that I NEED Optifine for anything like a smooth play of Tekkit (shit laptop) and, if I have to reinstall the mod every time I want to play, it replaces the modpack.jar file and, obviously, I then no longer have Optifine.

I've set my launcher to use the most recent beta release as some people have suggested, reset the pack, deleted absolutely everything and reinstalled it. Anyone able to shine some light on this for me?

I think the log I've included is relevant - I'm not a code wizard, but I'm guessing repeated use in the log of '[sEVERE]' is Java's way of telling me that something's fucked?

Error Messages:

Error Log:

--

2013/08/15 22:02:45 [iNFO] Technic Launcher is starting....

2013/08/15 22:02:45 [iNFO] Launcher Build: 253

2013/08/15 22:02:45 [iNFO] ------------ Startup Parameters ------------

2013/08/15 22:02:45 [iNFO] Relaunched with correct memory

2013/08/15 22:02:45 [iNFO] --------- End of Startup Parameters ---------

2013/08/15 22:02:50 [iNFO] Loaded face

2013/08/15 22:02:56 [iNFO] Starting download of http://skins.technicpack.net/helm/yorkshirerocket/100, with 3 tries remaining

2013/08/15 22:03:15 [iNFO] Launcher took: 31296ms to start

2013/08/15 22:04:03 [iNFO] Maximum usable memory detected: 1787 mb

2013/08/15 22:11:01 [iNFO] Preloaded 0 classes in advance

2013/08/15 22:11:02 [sEVERE] org.spoutcraft.launcher.exceptions.UnknownMinecraftException

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftLauncher.getMinecraftApplet(MinecraftLauncher.java:99)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.GameLauncher.runGame(GameLauncher.java:133)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.GameUpdater.runGame(GameUpdater.java:81)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.skin.LoginFrame.onEvent(LoginFrame.java:300)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.skin.LoginWorker.doInBackground(LoginWorker.java:102)

2013/08/15 22:11:02 [sEVERE] 	at org.jdesktop.swingworker.SwingWorker$1.call(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.util.concurrent.FutureTask.run(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at org.jdesktop.swingworker.SwingWorker.run(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.Thread.run(Unknown Source)

2013/08/15 22:11:02 [sEVERE] Caused by: java.lang.IncompatibleClassChangeError: Implementing class

2013/08/15 22:11:02 [sEVERE] 	at java.lang.ClassLoader.defineClass1(Native Method)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.ClassLoader.defineClass(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.security.SecureClassLoader.defineClass(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftClassLoader.findClassInjar(MinecraftClassLoader.java:169)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftClassLoader.findClass(MinecraftClassLoader.java:143)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.ClassLoader.defineClass1(Native Method)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.ClassLoader.defineClass(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.security.SecureClassLoader.defineClass(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftClassLoader.findClassInjar(MinecraftClassLoader.java:169)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftClassLoader.findClass(MinecraftClassLoader.java:143)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.ClassLoader.loadClass(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.Class.getDeclaredFields0(Native Method)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.Class.privateGetDeclaredFields(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at java.lang.Class.getDeclaredFields(Unknown Source)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftLauncher.setMinecraftDirectory(MinecraftLauncher.java:111)

2013/08/15 22:11:02 [sEVERE] 	at org.spoutcraft.launcher.launch.MinecraftLauncher.getMinecraftApplet(MinecraftLauncher.java:86)

2013/08/15 22:11:02 [sEVERE] 	... 11 more

2013/08/15 22:11:04 [iNFO] Maximum usable memory detected: 1787 mb

2013/08/15 22:12:39 [iNFO]