Fix mixin error

src/main/java/io/github/gaming32/worldhost/mixin/DisconnectedScreenAccessor.java

@@ -1,12 +1,21 @@
 package io.github.gaming32.worldhost.mixin;
 
 import net.minecraft.client.gui.screens.DisconnectedScreen;
-import net.minecraft.network.chat.Component;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.gen.Accessor;
 
+//#if MC >= 1.21
+import net.minecraft.network.DisconnectionDetails;
+//#else
+//$$ import net.minecraft.network.chat.Component;
+//#endif
+
 @Mixin(DisconnectedScreen.class)
 public interface DisconnectedScreenAccessor {
     @Accessor
-    Component getReason();
+    //#if MC >= 1.21
+    DisconnectionDetails getDetails();
+    //#else
+    //$$ Component getReason();
+    //#endif
 }

src/main/java/io/github/gaming32/worldhost/testing/WorldHostTesting.java

@@ -21,6 +21,7 @@
 import net.minecraft.client.gui.screens.multiplayer.SafetyScreen;
 import net.minecraft.client.gui.screens.worldselection.CreateWorldScreen;
 import net.minecraft.client.gui.screens.worldselection.SelectWorldScreen;
+import net.minecraft.network.chat.Component;
 
 import java.util.function.Supplier;
 
@@ -95,7 +96,12 @@ private static ScreenChain tryToJoinServer() {
             .maybe(DisconnectedScreen.class, () -> {
                 final var screen = (DisconnectedScreenAccessor)Minecraft.getInstance().screen;
                 assert screen != null;
-                throw new IllegalStateException("Unexpected disconnect trying to join server: " + screen.getReason().getString());
+                //#if MC >= 1.21
+                final Component reason = screen.getDetails().reason();
+                //#else
+                //$$ final Component reason = screen.getReason();
+                //#endif
+                throw new IllegalStateException("Unexpected disconnect trying to join server: " + reason.getString());
             })
             .skip(ReceivingLevelScreen.class);
     }