Posted August 7, 20178 yr Running the mods worked in 1.11 on same computer, same environment. When I try to launch my mod I get this error: java.lang.ClassNotFoundException: net.minecraftforge.fml.common.launcher.FMLTweaker at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_131] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_131] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) ~[?:1.8.0_131] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_131] at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:106) ~[launchwrapper-1.12.jar:?] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_131] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_131] at java.lang.Class.forName0(Native Method) ~[?:1.8.0_131] at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_131] 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:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_131] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_131] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131] at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?] at GradleStart.main(GradleStart.java:26) [start/:?]
August 8, 20178 yr Did you mess with the gradle file? You can get errors like this if you mess up the reobfuscation (or if you "export" from Eclipse instead of running gradlew build). The debugger is a powerful and necessary tool in any IDE, so learn how to use it. You'll be able to tell us more and get better help here if you investigate your runtime problems in the debugger before posting.
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