GOOD NEWS I've found a solution here: http://www.minecraftforum.net/topic/1513224-solved-a-mod-tried-to-open-a-gui-on-the-server-without-being-a-networkmod-solution-included/ Guess this notation isn't in any tutorial yet.

 

I've started developing my first GUI using this tutorial from this very site, but I've reached a problem in the very last thing that needs to be done, opening the GUI. The code states this code

 

player.openGui(YourMod.instance, 0, world, x, y, z);

 

will open the GUI when called in the onBlockActivated call for my block. Problem is, "YourMod.instance" (where YourMod is the class name of my mode) is not a valid variable, so Minecraft fails at that point. What would be the correct call for my mod's instance in this case?

i used the solution but now it crashes whenever i open a gui Error log:

 

      Minecraft has crashed!      
      ----------------------      

Minecraft has stopped running because it encountered a problem; Unexpected error
This error has been saved to C:\Users\Ash\Documents\Programming\MCP\jars\.\crash-reports\crash-2012-10-22_05.28.28-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 2a84ab19 --------
Generated 10/22/12 5:28 AM

- Minecraft Version: 1.3.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0_05, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 892157480 bytes (850 MB) / 1038876672 bytes (990 MB) up to 1038876672 bytes (990 MB)
- JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
- FML: FML v3.1.50.400 Minecraft Forge 4.2.5.317 3 mods loaded, 3 mods active
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
EC [Electro Craft] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
- LWJGL: 2.4.2
- OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2555, Intel
- Is Modded: Definitely; 'forge,fml'
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)
- World MpServer Entities: 1 total; [EntityClientPlayerMP['Player400'/3, l='MpServer', x=-2507.51, y=5.62, z=505.93]]
- World MpServer Players: 1 total; [EntityClientPlayerMP['Player400'/3, l='MpServer', x=-2507.51, y=5.62, z=505.93]]
- World MpServer Chunk Stats: MultiplayerChunkCache: 441
- Forced Entities: 1 total; [EntityClientPlayerMP['Player400'/3, l='MpServer', x=-2507.51, y=5.62, z=505.93]]
- Retry Entities: 0 total; []

java.lang.NullPointerException
at cpw.mods.fml.common.network.NetworkRegistry.openLocalGui(NetworkRegistry.java:322)
at cpw.mods.fml.common.network.FMLNetworkHandler.openGui(FMLNetworkHandler.java:341)
at net.minecraft.src.EntityPlayer.openGui(EntityPlayer.java:2051)
at Firediamond.Mods.Blocks.Discharger.onBlockActivated(Discharger.java:29)
at net.minecraft.src.PlayerControllerMP.onPlayerRightClick(PlayerControllerMP.java:322)
at net.minecraft.client.Minecraft.clickMouse(Minecraft.java:1318)
at net.minecraft.client.Minecraft.runTick(Minecraft.java:1731)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:845)
at net.minecraft.client.Minecraft.run(Minecraft.java:775)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT ae481e47 ----------

 

i used the solution but now it crashes whenever i open a gui Error log: -snip-

 

Judging from your error log, it looks like you're not returning a gui instance. You'll need to set a GuiHandler up to return one and register it.