Launcher fails to change modpack versions

[planetguy]

Launcher Version: 1.1.2.0

Operating System: Windows 7 64-bit

Java Version: 1.7.0_03

Antivirus Program: Avast

Description of Problem:

The Technic Launcher is unable to change or install new modpacks. (Tested Tekkit Lite and custom pack 3) I tried adding java as an exception in my antivirus and deleting the tekkitlite and launcher folders in my .technicpack folder. I also tried running the .jar version of the launcher, freshly downloaded from the pack homepage. The launcher launches modpacks as already installed successfully.

Error Messages:

Update Failed!

Error Log:

[17:06:06] [sEVERE] ------------------------------------------

[17:06:06] [sEVERE] Launcher is starting....

[17:06:06] [sEVERE] Launcher Build: '1.1.2.0'

[17:06:06] [sEVERE] Allocated 910.25 Mb of RAM

[17:06:06] [sEVERE] Java VM: '1.7.0_03-b05'

[17:06:06] [sEVERE] OS Version: '6.1'

[17:06:06] [sEVERE] Is 64-bit: 'true'

[17:06:06] [sEVERE] [info] Downloading 'mirrors.yml' from 'http://mirror.technicpack.net/Technic/mirrors.yml'.

[17:06:07] [sEVERE] Downloading 'http://206.217.207.1/Technic/CHECKSUM.md5'

[17:06:07] [sEVERE] Downloaded '\launcher\CHECKSUM.md5'

[17:06:08] [sEVERE] [MD5 Mismatch] File '\launcher\tekkitlite\modpack.yml' has md5 of 'a6e651c172a01f8cfc7e9ed34aa42fcb' instead of '448945a44c5bcfd20528b0adc52a69b9'

[17:06:08] [sEVERE] [info] Downloading 'modpack.yml' from 'http://mirror.technicpack.net/Technic/tekkitlite/modpack.yml'.

[17:06:09] [sEVERE] [info] Downloading 'minecraft.yml' from 'http://mirror.technicpack.net/Technic/minecraft.yml'.

[17:06:17] [sEVERE] \tekkitlite\bin\natives does not exist! Updating..

[17:06:17] [sEVERE] 'basemods-tekkitlite-v0.5.6.zip' has MD5 mismatch! Updating..

[17:06:17] [sEVERE] java.lang.NumberFormatException: For input string: "null"

[17:06:17] [sEVERE] at java.lang.NumberFormatException.forInputString(Unknown Source)

[17:06:17] [sEVERE] at java.lang.Integer.parseInt(Unknown Source)

[17:06:17] [sEVERE] at java.lang.Integer.<init>(Unknown Source)

[17:06:17] [sEVERE] at org.spoutcraft.launcher.MinecraftYML.compareVersions(

[17:06:17] [sEVERE] at java.lang.Thread.run(Unknown Source)MinecraftYML.java:92)

[17:06:17] [sEVERE] at org.spoutcraft.launcher.MinecraftYML.getLatestCachedMinecraft(MinecraftYML.java:77)

[17:06:17] [sEVERE] at org.spoutcraft.launcher.MinecraftDownloadUtils.downloadMinecraftVersion(MinecraftDownloadUtils.java:60)

[17:06:17] [sEVERE] at org.spoutcraft.launcher.MinecraftDownloadUtils.downloadMinecraft(MinecraftDownloadUtils.java:15)

[17:06:17] [sEVERE] at org.spoutcraft.launcher.GameUpdater.updateMC(GameUpdater.java:124)

[17:06:17] [sEVERE] at org.spoutcraft.launcher.gui.LoginForm$3.doInBackground(LoginForm.java:826)

[17:06:17] [sEVERE] at org.spoutcraft.launcher.gui.LoginForm$3.doInBackground(LoginForm.java:808)

[17:06:17] [sEVERE] at javax.swing.SwingWorker$1.call(Unknown Source)

[17:06:17] [sEVERE] at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)

[17:06:17] [sEVERE] at java.util.concurrent.FutureTask.run(Unknown Source)

[17:06:17] [sEVERE] at javax.swing.SwingWorker.run(Unknown Source)

[17:06:17] [sEVERE] at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

[17:06:17] [sEVERE] at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

[17:06:20] [sEVERE] Exiting the Technic Launcher

Edit: Cleared cache and the launcher worked. This problem doesn't seem to be in "common problems and fixes", I found it browsing a random other thread. Consider adding it there?