I have been trying to test run Minecraft 1.7.10 in eclipse but I keep occurring into this error:

 

 

 

 

[18:57:29] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[18:57:29] [main/ERROR]: Unable to launch

java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker

at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_25]

at java.net.URLClassLoader$1.run(Unknown Source) ~[?:1.8.0_25]

at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]

at java.net.URLClassLoader.findClass(Unknown Source) ~[?:1.8.0_25]

at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_25]

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[?:1.8.0_25]

at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_25]

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.11.jar:?]

at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_25]

at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_25]

at java.lang.Class.forName0(Native Method) ~[?:1.8.0_25]

at java.lang.Class.forName(Unknown Source) ~[?:1.8.0_25]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:98) [launchwrapper-1.11.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]

Java HotSpot 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

 

 

 

 

Please help!

if you using Java 8 newest version it isn't work, you have to use jdk 7 or jdk 8u5 version.

Do you have GradleStart as the main class in the run configurations?

 

I used to, when I had it on the main class it said in the console:

 

"Error: Could not find or load main class GradleStart"

 

This is what I currently have set to my run condigurations:

 

net.minecraft.launchwrapper.Launch

 

But it gave me the error on the main post of this topic.