add log4j

build.gradle

@@ -1,5 +1,6 @@
 buildscript {
     repositories {
+    	mavenCentral()
 		jcenter()
         maven {
             name = "Fabric"
@@ -35,6 +36,10 @@ minecraft {
 }
 
 dependencies {
+    // fabric loader requires log4j
+	implementation group: 'org.apache.logging.log4j', name: 'log4j-api', version: '2.8.1'
+	implementation group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.8.1'
+
 	//to change the versions see the gradle.properties file
 	minecraft "com.mojang:minecraft:${project.minecraft_version}"
 

src/main/java/tk/valoeghese/example/mixin/ExampleMixin.java

@@ -6,7 +6,6 @@ import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 import net.minecraft.client.gui.screen.TitleScreen;
-import net.minecraft.client.screen.MainMenuScreen;
 
 @Mixin(TitleScreen.class)
 public class ExampleMixin {