Cannot launch any modpacks

  • Thread starter Thread starter dmniticrtdit
  • Start date Start date
  • Tech Support section is for getting help with FTB related problems. If there's a repeatable issue that can be labeled as a bug, then please use the issue tracker for the pack or the app at GitHub issue trackers - If there's no repository for a pack that means that the pack is old and/or will not be updated. Bugs for older packs will not be fixed, unless they are critical.
  • The FTB Forum is now read-only, and is here as an archive. To participate in our community discussions, please join our Discord! https://ftb.team/discord
D

dmniticrtdit

Guest
I cannot launch any modpacks.Minecraft launcher appears and i click "play" button then immediately shows the error page.I use java 7 update 80.The error is:
[15:10:23] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[15:10:23] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader$1.run(URLClassLoader.java:372) ~[?:1.8.0_25]
at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.8.0_25]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]
at java.net.URLClassLoader.findClass(URLClassLoader.java:360) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_25]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_25]
at java.lang.Class.forName0(Native Method) ~[?:1.8.0_25]
at java.lang.Class.forName(Class.java:344) ~[?:1.8.0_25]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=256m; support was removed in 8.0
 
Kel_Co said:
Hi! I can't really use much from this pasted text, can you locate the log file that this is in and post it as a .txt file?
However, from what I can see it looks like it cannot find forge for some reason.

Thanks!

Nevermind, just found a similar thread posting.

Follow the instructions at this link:
https://gist.github.com/jikuja/7e0828dca7d264e850be306b58893127
Click to expand...
I did the instructions by one by but i have the same problem.Where can i go to ftb log file?
 
OK,i fixed it i just deleted the wrong forge version,sorry :D
 
Err, what pack are you using? I think the magic bees version may be a bit old, so updating to the latest on both forestry and magic bees may work.
 
  • Like
Reactions: dmniticrtdit
Kel_Co said:
Err, what pack are you using? I think the magic bees version may be a bit old, so updating to the latest on both forestry and magic bees may work.
Click to expand...
I'm trying to launch infinity evolved.
 
Kel_Co said:
huh. Try backing up what files you may have and reinstalling the latest version of the pack.
Click to expand...
Nope,it didn't work i'll try to update mods.
EDIT::Not worked.
 
Last edited:
You must log in or register to reply here.
Top Bottom