Bug FTB Unstable 1.10 not launching

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A

Alienz14z

New Member
Jul 29, 2019
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I keep getting the same error on FTB Unstable 1.10, Version 4.1.2, forge-12.18.0.2000

2016-07-03 09:57:41,118 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[09:57:41] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[09:57:41] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.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


Please help :)
 
Last edited:
I am not sure, if i can help. but i had the same problem with the curse app. If you are using the curse app to launch the modpack it is possible there is not enough RAM reserved for java. You can manually change the profil settings, just uncheck the setting (should read someting like "system settings") and you can manually change the RAM for the modpack. Try the "recommended" range.
 
Pallitax said:
I am not sure, if i can help. but i had the same problem with the curse app. If you are using the curse app to launch the modpack it is possible there is not enough RAM reserved for java. You can manually change the profil settings, just uncheck the setting (should read someting like "system settings") and you can manually change the RAM for the modpack. Try the "recommended" range.
Click to expand...
Nope same error. Thanks though.
 
one question: do you have the regulary mod pack only or have you added soemething, like Optifine? Or manuallly updated a mod? Or a mod not compatible with that forge version? i have googled the error message "java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker" . It sounds there is a mod not compatible with the forge version. But i am not a specialist. though. For me the ftb unstable 1.10 works fine with the latest version. You should - in addition - check your Java Version, if it is the newest one.
Edit: is says 1.8.0 something..... that sounds as if it is the wrong forge version somehow, as if it is the forge version for MC 1.8. Check if the loaded forge version is really the one you stated in your message (which would be the right one). You might have accidantly changed it in the curse app profile settings.
 
Last edited:
Pallitax said:
one question: do you have the regulary mod pack only or have you added soemething, like Optifine? Or manuallly updated a mod? Or a mod not compatible with that forge version? i have googled the error message "java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker" . It sounds there is a mod not compatible with the forge version. But i am not a specialist. though. For me the ftb unstable 1.10 works fine with the latest version. You should - in addition - check your Java Version, if it is the newest one.
Edit: is says 1.8.0 something..... that sounds as if it is the wrong forge version somehow, as if it is the forge version for MC 1.8. Check if the loaded forge version is really the one you stated in your message (which would be the right one). You might have accidentally changed it in the curse app profile settings.
Click to expand...
I have Java with the most current update and I've re downloaded the pack multiple times with the 4.1.1, 4.1.0 and with different forge versions cause that's what I thought as well. If i use forge version 1968 it"ll load halfway but then some of the mods need a newer version so it stops.
 
I am having the same problem with the curse launcher as well. moved over to the FTB launcher and the pack downloads and plays just fine. I think there is an issue with this mod pack and the curse launcher.
 
Dagepyro said:
I am having the same problem with the curse launcher as well. moved over to the FTB launcher and the pack downloads and plays just fine. I think there is an issue with this mod pack and the curse launcher.
Click to expand...
I tried to do that but for some reason I couldn't find the ftb launcher download it kept forwarding me to the curse launcher download, could you link me?
 
Alienz14z said:
I tried to do that but for some reason I couldn't find the ftb launcher download it kept forwarding me to the curse launcher download, could you link me?
Click to expand...
under the download button, there is a link underneath that says legacy download.
 
Hello! The pack for Unstable 1.10 has only 3mb :D i think it is not good.. or is that correct? bcs in folder "modes" we are missing modes, solve it please!
 
Alienz14z said:
I keep getting the same error on FTB Unstable 1.10, Version 4.1.2, forge-12.18.0.2000

2016-07-03 09:57:41,118 WARN Unable to instantiate org.fusesource.jansi.WindowsAnsiOutputStream
[09:57:41] [main/INFO]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLTweaker
[09:57:41] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: net.minecraftforge.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


Please help :)
Click to expand...
i think i found out..... you get this error if your java isnt the newest one. Update Java to at least 91 or 92 and make sure your Curse finds it. It should work then. It also happens if you have an old java IN ADDITION to a new one and curse finds only the old..... perhaps deinstall java complete - every version - and reinstall. It should work then
 
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