Fixed servers.

src/main/java/vazkii/botania/common/block/BlockBifrost.java

@@ -94,6 +94,7 @@ public class BlockBifrost extends BlockModContainer implements ILexiconable {
 	}
 
 	@Override
+	@SideOnly(Side.CLIENT)
 	public void registerBlockIcons(IIconRegister par1IconRegister) {
 		// NO-OP
 	}