Fixed server crash >.<

src/main/java/vazkii/botania/common/lexicon/page/PageTutorial.java

@@ -18,6 +18,8 @@ import net.minecraft.util.EnumChatFormatting;
 import net.minecraft.util.StatCollector;
 import vazkii.botania.api.internal.IGuiLexiconEntry;
 import vazkii.botania.client.gui.lexicon.GuiLexicon;
+import cpw.mods.fml.relauncher.Side;
+import cpw.mods.fml.relauncher.SideOnly;
 
 public class PageTutorial extends PageText {
 
@@ -39,6 +41,7 @@ public class PageTutorial extends PageText {
 	}
 
 	@Override
+	@SideOnly(Side.CLIENT)
 	public void onActionPerformed(IGuiLexiconEntry gui, GuiButton button) {
 		if(button == this.button) {
 			GuiLexicon.startTutorial();