Prints an error on startup regarding a missing Coremod class

[Charsy89]

The mod causes FML to print the following error on startup:

[19:25:33] [main/ERROR] [FML]: Coremod RFEarlyMixins: Unable to class load the plugin com.voidsrift.riftflux.RFEarlyMixins
java.lang.ClassNotFoundException: com.voidsrift.riftflux.RFEarlyMixins
	at java.net.URLClassLoader.findClass(URLClassLoader.java:387) ~[?:1.8.0_472]
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:117) ~[launchwrapper-1.12.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[?:1.8.0_472]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[?:1.8.0_472]
	at java.lang.Class.forName0(Native Method) ~[?:1.8.0_472]
	at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_472]
	at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:460) [forge-1.7.10-10.13.4.1614-1.7.10-universal.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_472]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_472]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_472]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_472]
	at org.spongepowered.asm.launch.platform.MixinPlatformAgentFMLLegacy.injectCorePlugin(MixinPlatformAgentFMLLegacy.java:255) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.platform.MixinPlatformAgentFMLLegacy.initFMLCoreMod(MixinPlatformAgentFMLLegacy.java:170) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.platform.MixinPlatformAgentFMLLegacy.accept(MixinPlatformAgentFMLLegacy.java:156) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.platform.MixinContainer.<init>(MixinContainer.java:74) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.platform.MixinPlatformManager.createContainerFor(MixinPlatformManager.java:150) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.platform.MixinPlatformManager.addContainer(MixinPlatformManager.java:137) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.platform.MixinPlatformManager.scanForContainers(MixinPlatformManager.java:227) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.platform.MixinPlatformManager.init(MixinPlatformManager.java:109) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.MixinBootstrap.getPlatform(MixinBootstrap.java:118) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.MixinBootstrap.start(MixinBootstrap.java:166) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at org.spongepowered.asm.launch.MixinTweaker.<init>(MixinTweaker.java:46) [+unimixins-all-1.7.10-0.3.1.jar:0.15.6+mixin.0.8.7]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [?:1.8.0_472]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) [?:1.8.0_472]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [?:1.8.0_472]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) [?:1.8.0_472]
	at java.lang.Class.newInstance(Class.java:442) [?:1.8.0_472]
	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 org.prismlauncher.launcher.impl.StandardLauncher.launch(StandardLauncher.java:115) [NewLaunch.jar:?]
	at org.prismlauncher.EntryPoint.listen(EntryPoint.java:129) [NewLaunch.jar:?]
	at org.prismlauncher.EntryPoint.main(EntryPoint.java:70) [NewLaunch.jar:?]

This is likely caused by carried-over build configuration from RiftFlux, as there is no such class com.voidsrift.riftflux.RFEarlyMixins in this mod, and it is only mentioned in build.gradle.