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Based on one of Eyamaz's posts in his JVM Arguments thread, I right-clicked my Computer icon (windows 7), selected Properties, then selected Advanced system settings, and then clicked the Environment Variables button. In the System variables I find, as the first entry, "_JAVA_OPTIONS" with a...

I think the place to remove it is in the Windows Environment Variables, NOT in the Java control panel. Of course if it's in the Java control panel, it needs to be removed from there. I've been having a similar error where "-Xmx512M" is being added to the end of the FTB launcher JVM options...

After a bit of research and self-education, I believe the -Xmx512M java option at the end of the JVM Flags line is the problem. JVM Flags: 9 total; -Xms256M -Xmx5120M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+AggressiveOpts -XX:+CMSClassUnloadingEnabled -XX:permSize=128m...

Oh, is it this one from ...\Desktop\FTB\Horizons\minecraft\crash-reports\ ?? http://pastebin.com/Ep7Z8pJk

Another run. In this one, I only added "-XX:permSize=1024M" to the additional java parms, nothing else changed, including the error and crash. New console log: http://pastebin.com/UXAcf6B9 No texture or sound packs in use, strictly a clean install of the modpack. Tell me where I can find it?

That particular run had no additional java parms entered by me. However, I did have both 32 and 64 bit java installed. I have started over with the troubleshooting guide, removing the launcher, modpack, and all other files and folders in my FTB folder, removing ftblauncher folder, uninstalling...

Bump...any ideas?

So, at least on my machine, the parms for the launcher do not work. I set the max ram slider to 2048 and copy/pasted the listed parms into the additional java parms box. Here's the result: Setting MinMemory to 256 Setting MaxMemory to 2048 Error occurred during initialization of VM...

Operating System, bit type: amd64 Windows 7 6.1 Java version/update, bit type: 1.7.0_45 Anti-malware software: Webroot SecureAnywhere Location you're downloading from: Set to Automatic Launcher version: 1.2.9 Completed the troubleshooting guide (y/n): yes Console log, pastebin.com link...