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[1.7.10]Server crashes after changing a Gui class variable from a block class


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My Block class:


public class LobbyBlock extends Block {

public LobbyBlock(Material rock) {
	this.setBlockTextureName(Main.MODID + ":" + "0");

public TileEntity createTileEntity(World world, int metadata) {
	return new TileEntityData();

public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int par6, float par7,
		float par8, float par9) {

	GuiLobby.blockPosX = x;
	GuiLobby.blockPosY = y;
	GuiLobby.blockPosZ = z;
	GuiLobby.player = player;
	GuiLobby.world = world;

	TileEntityData tile = (TileEntityData) world.getTileEntity(x, y, z);

	if (tile.IsGuiOpen == false) {
		tile.IsGuiOpen = true;
		FMLNetworkHandler.openGui(player, Main.instance, 0, world, x, y, z);

	return true;


My Gui class:


public class GuiLobby extends GuiScreen {

public static int blockPosX;
public static int blockPosY;
public static int blockPosZ;
public static EntityPlayer player;
public static World world;

public boolean doesGuiPauseGame() {
	return false;

int guiWidth = 256;
int guiHeight = 168;

public void drawScreen(int x, int y, float ticks) {
	int guiX = (width - guiWidth) / 2;
	int guiY = (height - guiHeight) / 2;

	this.buttonList.add(new GuiButton(0, guiX + 5, guiY + 5, 98, 20, I18n.format("Host Game", new Object[0])));

	GL11.glColor4f(1, 1, 1, 1);
	mc.renderEngine.bindTexture(new ResourceLocation(Main.MODID + ":" + "textures/gui/Lobby.png"));
	drawTexturedModalRect(guiX, guiY, 0, 0, guiWidth, guiHeight);

	super.drawScreen(x, y, ticks);

protected void keyTyped(char letter, int number) {
	switch (number) {
	case 1:
		this.mc.displayGuiScreen((GuiScreen) null);
		TileEntityData tile = (TileEntityData) world.getTileEntity(blockPosX, blockPosY, blockPosZ);
		tile.IsGuiOpen = false;

	switch (letter) {
	case 'e':
	case 'E':
		this.mc.displayGuiScreen((GuiScreen) null);
		TileEntityData tile = (TileEntityData) world.getTileEntity(blockPosX, blockPosY, blockPosZ);
		tile.IsGuiOpen = false;

protected void actionPerformed(GuiButton button) {
	if (button.id == 0) {

		TileEntityData tile = (TileEntityData) world.getTileEntity(blockPosX, blockPosY, blockPosZ);
		tile.Name = player.getDisplayName();

		world.setBlock(blockPosX, blockPosY, blockPosZ, Blocks.LobbyBlock1);

		this.mc.displayGuiScreen((GuiScreen) null);

public void onGuiClosed() {
	TileEntityData tile = (TileEntityData) world.getTileEntity(blockPosX, blockPosY, blockPosZ);
	tile.IsGuiOpen = false;


My Main class:


@Mod(modid = Main.MODID, name = Main.NAME, version = "PreAlpha 0.0.3")
public class Main {
public static Main instance;

public static final String MODID = "PAYDAY2";
public static final String NAME = "PAYDAY 2";
public static final String VERSION = "PreAlpha 0.0.3";

public Main() {


public void preInit(FMLPreInitializationEvent event) {
	FMLCommonHandler.instance().bus().register(new Events());

public void Init(FMLInitializationEvent event) {
	NetworkRegistry.INSTANCE.registerGuiHandler(Main.instance, new GuiHandler());
	GameRegistry.registerTileEntity(TileEntityData.class, "Host");
	GameRegistry.registerTileEntity(TileEntityData.class, "IsGuiOpen");

public void postInit(FMLPostInitializationEvent event) {



My GuiHandler class:


public class GuiHandler implements IGuiHandler {

public GuiHandler() {

public Object getClientGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
	if (ID == 0) {
		return new GuiLobby();
	if (ID == 1) {
		return new GuiLobbyHosted();
	if (ID == 2) {
		return new GuiLobbyHost();
	return null;

public Object getServerGuiElement(int ID, EntityPlayer player, World world, int x, int y, int z) {
	// TODO Auto-generated method stub
	return null;


And the class I register blocks with:


public class Blocks {
public static Block LobbyBlock = new LobbyBlock(Material.rock);
public static Block LobbyBlock1 = new LobbyBlock1(Material.rock);
public static Block LobbyBlock2 = new LobbyBlock2(Material.rock);
public static Block LobbyBlock3 = new LobbyBlock3(Material.rock);
public static Block LobbyBlock4 = new LobbyBlock4(Material.rock);
public static Block LobbyBlockHosted = new LobbyBlockHosted(Material.rock);
public static Block LobbyBlockOccupied = new LobbyBlockOccupied(Material.rock);

public static List<Block> blockList = new ArrayList<Block>();

public static void registerBlocks() {

	for (Block block : blockList) {
		GameRegistry.registerBlock(block, block.getUnlocalizedName());


What I want is to change the blockPosX, blockPosY, blockPosZ, player and world variables that are in the GuiLobby class from the LobbyBlock class ON THE SERVER.


Here you have the crash log:


---- Minecraft Crash Report ----

// Shall we play a game?


Time: 9.9.15 17:13

Description: Exception in server tick loop


java.lang.NoClassDefFoundError: com/tominocz/PAYDAY2/gui/GuiLobby

at com.tominocz.PAYDAY2.blocks.LobbyBlock.onBlockActivated(LobbyBlock.java:34)

at net.minecraft.server.management.ItemInWorldManager.activateBlockOrUseItem(ItemInWorldManager.java:409)

at net.minecraft.network.NetHandlerPlayServer.processPlayerBlockPlacement(NetHandlerPlayServer.java:593)

at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:74)

at net.minecraft.network.play.client.C08PacketPlayerBlockPlacement.processPacket(C08PacketPlayerBlockPlacement.java:122)

at net.minecraft.network.NetworkManager.processReceivedPackets(NetworkManager.java:241)

at net.minecraft.network.NetworkSystem.networkTick(NetworkSystem.java:182)

at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:726)

at net.minecraft.server.dedicated.DedicatedServer.updateTimeLightAndEntities(DedicatedServer.java:349)

at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:614)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:485)

at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:752)

Caused by: java.lang.ClassNotFoundException: com.tominocz.PAYDAY2.gui.GuiLobby

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

... 12 more

Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/gui/GuiScreen

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:760)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:182)

... 14 more

Caused by: java.lang.ClassNotFoundException: net.minecraft.client.gui.GuiScreen

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:101)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

... 18 more



A detailed walkthrough of the error, its code path and all known details is as follows:



-- System Details --


Minecraft Version: 1.7.10

Operating System: Windows 10 (amd64) version 10.0

Java Version: 1.8.0_60, Oracle Corporation

Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

Memory: 929853040 bytes (886 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)

JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M

AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94

FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 4 mods loaded, 4 mods active

States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored

UCHIJAAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)

UCHIJAAAA FML{} [Forge Mod Loader] (forgeSrc-1.7.10-

UCHIJAAAA Forge{} [Minecraft Forge] (forgeSrc-1.7.10-

UCHIJAAAA PAYDAY2{PreAlpha 0.0.3} [PAYDAY 2] (bin)

Profiler Position: N/A (disabled)

Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used

Player Count: 1 / 20; [EntityPlayerMP['Player32'/365, l='world', x=128,50, y=67,00, z=246,50]]

Is Modded: Definitely; Server brand changed to 'fml,forge'

Type: Dedicated Server (map_server.txt)


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