Crashing at launch

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Yep. Java 7, MacOS and FTB do not play nice together. If you wish to keep Java 7 then you must update your lwjgl inside each of the mod pack folders that you wish to play with. Look here to update your lwjgl, substitute the ~/Library/Application Support folder with the mod pack folder. You will need to do this for each pack as each pack has its own version of lwjgl.

If you wish to downgrade to Java 6 instead look here part 3.
 
lavarthan said:
Yep. Java 7, MacOS and FTB do not play nice together. If you wish to keep Java 7 then you must update your lwjgl inside each of the mod pack folders that you wish to play with. Look here to update your lwjgl, substitute the ~/Library/Application Support folder with the mod pack folder. You will need to do this for each pack as each pack has its own version of lwjgl.

If you wish to downgrade to Java 6 instead look here part 3.
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Could you be a little clearer on the replace part? I have the exact same problem and I don't know what you mean by substituting the App support folder with the mod pack folder.
 
Decyphorus said:
Could you be a little clearer on the replace part? I have the exact same problem and I don't know what you mean by substituting the App support folder with the mod pack folder.
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That is where, I believe, if you were playing vanilla minecraft you would update the files but with ftb the files will be where you installed the modpacks to.
 
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In vanilla minecraft it installs to the '~/Library/Application Support' folder. For the FTB mod packs it will be the folder where you installed the packs. So if you need help finding that folder check out these steps.
1) Open the launcher and choose MODPACKS tab
2) Click on the mod pack you wish to update the lwjgl for.
3) Click on the 'Edit Mod Pack' button.
4) Click on the 'Open Folder' button.
5) Now go back (or up) one folder in the folder structure. So if you are on 'C:\Users\User\Desktop\FTB Launcher\Unleashed\minecraft\mods' You want to go to 'C:\Users\User\Desktop\FTB Launcher\Unleashed\minecraft\'
6) From there you are in the minecraft folder just replace the files in the folders as the guide suggests.
So with the above folder structure the first folder you need to add the files to in the guide is 'C:\Users\User\Desktop\FTB Launcher\Unleashed\minecraft\bin\'
Then 'C:\Users\User\Desktop\FTB Launcher\Unleashed\minecraft\bin\natives\' and so on.

I hope that explains what I mean. Be sure to do this for each mod pack you wish to use. If you need to update another pack just follow from step one and choose the other pack instead.

Edit: Sorry for using windows folders, but I hope you get the idea.
 
Caught exception from WR-CBE|Addons
java.lang.NoClassDefFoundError: org/lwjgl/util/Dimension
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This still appears to be a problem with your lwjgl. Just a thought since it is lwjgl/util I wonder if you skipped a part. I do not have a Mac so I'm not 100% sure of which folder to use, but the guide does mention this and it gives a windows folder as far as I can tell. Which is why I do not know the Mac folder version. Check the mod pack folder to be sure.

All operating systems

You should replace these files in .minecraft/bin/
  • jinput.jar
  • lwjgl.jar
  • lwjgl_util.jar
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I would suggest a force update to see if it was WR-CBE that is the problem, but that would also reset your lwjgl version back to 2.4.2 and you would have to update it again :( Good luck.
 
I had put in the wrong util.jar so FTB launches now! however (as always) the entire screen in flipped and mirrored. It is quite humerous actually! thank you so much for your help!
Screen Shot 2013-10-26 at 6.13.59 PM.png
 
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Hey There im having the same problem I have windows 8 6GB Ram running FTB on only 2.5GB when I go to open it, it just Crashes My Java Is fully Up to date From this Day! Please help me :)
 
Aoeloss said:
Hey There im having the same problem I have windows 8 6GB Ram running FTB on only 2.5GB when I go to open it, it just Crashes My Java Is fully Up to date From this Day! Please help me :)
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Same problem probably, different reason and solution. He is on a Mac you are on windows which does not have to worry about updating the lwjgl. Please follow this guide first. After following the guide if you are still experiencing problems please start a new thread with a link to the pastebin.com of your log. To do this click on the 'Paste my log to pastebin.com' button on the console after it crashes. This will create a link at the bottom of the console, pastebin.com/xxxxx, put that in the new link with a description of your problem. Be sure to check here so your log does not get deleted.
 
(The requested operation cannot be performed on a file with a user-mapped section open)
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Welcome. This is a common and old error in which your antivirus program is being over zealous in its protection of you. I want to say add the folder 'C:\Users\Logan Game\Documents' to the exceptions list of your antivirus program, but that would include all the files in your documents folder which would not be safe as there might be other files in there you want to have scanned. So please give FTB its own folder at 'C:\Users\Logan Game\Documents\FTB', create the FTB folder and place the launcher and pack folders into it and change the 'Install folder...' to 'C:\Users\Logan Game\Documents\FTB' in the Options tab inside the launcher to it. Then add 'C:\Users\Logan Game\Documents\FTB' to the exceptions list of your antivirus program. Be sure to check any boxes that say 'include sub-folders. This will keep only the FTB files from being scanned and keep you getting this error.
 
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