Launcher fails to verify minecraft.jar

[oz1999]

Launcher Version: 253

Operating System: Windows 8.1 Pro Preview

Java Version: Java 7 Update 25. I also tried Update 40 but same issue.

Antivirus Program: Windows Defender (definately not blocking the launcher - exception added)

Description of Problem:

I have successfully ported Minecraft 1.6.2 to work on the old Minecraft 1.5.2 launcher and it works fine. However, when attempting to do exactly the same on the Technic launcher, it gives me that error.

Error Messages:

Your Minecraft installation is corrupt, but has been cleaned. Try to login again.

If that fails, close and restart the application.

Error Log:

2013/09/10 13:53:51 [iNFO] ------------------------------------------

 2013/09/10 13:53:51 [iNFO] Technic Launcher is starting....

 2013/09/10 13:53:51 [iNFO] Launcher Build: 253

 2013/09/10 13:53:51 [iNFO] ------------ Startup Parameters ------------

 2013/09/10 13:53:51 [iNFO] --------- End of Startup Parameters ---------

 2013/09/10 13:53:51 [iNFO] Attempting relaunch with 1536 mb of RAM

 2013/09/10 13:53:51 [iNFO] Path to Launcher Jar: C:\Users\oscar\Desktop\Technic Launcher.exe

 2013/09/10 13:53:51 [iNFO] Attempting relaunch with -XX:MaxPermSize=128m as permgen

 2013/09/10 13:53:54 [iNFO] Loaded face

 2013/09/10 13:54:00 [iNFO] Pack: lifemmo Image Download Worker Calculated MD5: 61a531dd19f73737a3b78c7e3c26e8b0 Required MD5: bb0e10289bbd3cf151fbbd6123725b20

 2013/09/10 13:54:00 [iNFO] Starting download of http://cdn.technicpack.net/platform/pack-backgrounds/168857.png?1378513428, with 3 tries remaining

 2013/09/10 13:54:00 [iNFO] Starting download of http://skins.technicpack.net/helm/Paint_Ninja/100, with 3 tries remaining

 2013/09/10 13:54:00 [iNFO] Pack: craftmine Image Download Worker Calculated MD5: dfb5f8c94dd871bfa000880e54568713 Required MD5: 9b95bf8149b75b734d96e45b618a1055

 2013/09/10 13:54:00 [iNFO] Starting download of http://cdn.technicpack.net/platform/pack-logos/3370.png?1378806966, with 3 tries remaining

 2013/09/10 13:54:00 [iNFO] Pack: craftmine Image Download Worker Calculated MD5: dfb5f8c94dd871bfa000880e54568713 Required MD5: 9b95bf8149b75b734d96e45b618a1055

 2013/09/10 13:54:00 [iNFO] Starting download of http://cdn.technicpack.net/platform/pack-logos/3370.png?1378806966, with 3 tries remaining

 2013/09/10 13:54:00 [iNFO] Pack: craftmine Image Download Worker Calculated MD5: d45c229c42c4468e1573130630aeb185 Required MD5: 9c74691c3858ceabb9c4d25b77ed0577

 2013/09/10 13:54:00 [iNFO] Starting download of http://cdn.technicpack.net/platform/pack-backgrounds/3370.png?1378806966, with 3 tries remaining

 2013/09/10 13:54:00 [iNFO] Launcher took: 8364ms to start

 2013/09/10 13:54:07 [iNFO] Mod pack Build: 1.6 Minecraft Version: 1.5.2

 2013/09/10 13:54:08 [iNFO] Mod craftmine-dev-1.6.zip already found in the cache.

 2013/09/10 13:54:08 [iNFO] Expected MD5: null Calculated MD5: 1602ab31cbf92c1eedfa28f7d6e7d6ba

 2013/09/10 13:54:08 [iNFO] Starting download of https://copy.com/DL0HuXdXJko3VpAz, with 3 tries remaining

 2013/09/10 13:54:20 [iNFO] Preloaded 0 classes in advance

 2013/09/10 13:54:21 [sEVERE] Sep 10, 2013 1:54:21 PM org.spoutcraft.launcher.GameLauncher runGame

 SEVERE: Minecraft Verification error

 org.spoutcraft.launcher.exceptions.MinecraftVerifyException

 at org.spoutcraft.launcher.launch.MinecraftLauncher.getMinecraftApplet(MinecraftLauncher.java:97)

 at org.spoutcraft.launcher.GameLauncher.runGame(GameLauncher.java:133)

 at org.spoutcraft.launcher.GameUpdater.runGame(GameUpdater.java:81)

 at org.spoutcraft.launcher.skin.LoginFrame.onEvent(LoginFrame.java:321)

 at org.spoutcraft.launcher.skin.LoginWorker.doInBackground(LoginWorker.java:154)

 at org.jdesktop.swingworker.SwingWorker$1.call(Unknown Source)

 at java.util.concurrent.FutureTask.run(Unknown Source)

 at org.jdesktop.swingworker.SwingWorker.run(Unknown Source)

 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

 at java.lang.Thread.run(Unknown Source)

 Caused by: java.lang.VerifyError: (class: net/minecraft/client/Minecraft, method: K signature: ()V) Incompatible argument to function

 at java.lang.Class.getDeclaredFields0(Native Method)

 at java.lang.Class.privateGetDeclaredFields(Unknown Source)

 at java.lang.Class.getDeclaredFields(Unknown Source)

 at org.spoutcraft.launcher.launch.MinecraftLauncher.setMinecraftDirectory(MinecraftLauncher.java:111)

 at org.spoutcraft.launcher.launch.MinecraftLauncher.getMinecraftApplet(MinecraftLauncher.java:86)

 ... 10 more



 2013/09/10 13:54:21 [sEVERE] Sep 10, 2013 1:54:21 PM org.spoutcraft.launcher.GameLauncher runGame

 SEVERE: Minecraft Verification error

 org.spoutcraft.launcher.exceptions.MinecraftVerifyException

 at org.spoutcraft.launcher.launch.MinecraftLauncher.getMinecraftApplet(MinecraftLauncher.java:97)

 at org.spoutcraft.launcher.GameLauncher.runGame(GameLauncher.java:133)

 at org.spoutcraft.launcher.GameUpdater.runGame(GameUpdater.java:81)

 at org.spoutcraft.launcher.skin.LoginFrame.onEvent(LoginFrame.java:321)

 at org.spoutcraft.launcher.skin.LoginWorker.doInBackground(LoginWorker.java:154)

 at org.jdesktop.swingworker.SwingWorker$1.call(Unknown Source)

 at java.util.concurrent.FutureTask.run(Unknown Source)

 at org.jdesktop.swingworker.SwingWorker.run(Unknown Source)

 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

 at java.lang.Thread.run(Unknown Source)

 Caused by: java.lang.VerifyError: (class: net/minecraft/client/Minecraft, method: K signature: ()V) Incompatible argument to function

 at java.lang.Class.getDeclaredFields0(Native Method)

 at java.lang.Class.privateGetDeclaredFields(Unknown Source)

 at java.lang.Class.getDeclaredFields(Unknown Source)

 at org.spoutcraft.launcher.launch.MinecraftLauncher.setMinecraftDirectory(MinecraftLauncher.java:111)

 at org.spoutcraft.launcher.launch.MinecraftLauncher.getMinecraftApplet(MinecraftLauncher.java:86)

 ... 10 more

[theprolo]

The technic launcher isn't built to use MC 1.6.2, and doesn't recognise it. It makes sure that your Minecraft.jar has downloaded correctly by checking the file against the Minecraft versions it knows. If it doesn't match, it pulls that error. You'll have to be patient and wait if you want 1.6.2 + on the launcher - from what I understand the new Minecraft launcher has changed how things work inside, and at the same time more features are being added to the technic launcher. There's no hard ETA, but they're working on an update to support 1.6 among other things.