Here is the crash report when I try and open the replay viewer.. (I have assigned 8gb of ram.) ---- Minecraft Crash Report ---- // I blame Dinnerbone. Time: 09/01/17 18:06 Description: Unexpected error java.lang.NullPointerException: Unexpected error at net.minecraft.client.multiplayer.PlayerControllerMP.func_78750_j(PlayerControllerMP.java:344) at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:317) at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1632) at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1028) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:345) at net.minecraft.client.main.Main.main(SourceFile:120) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Stacktrace: at net.minecraft.client.multiplayer.PlayerControllerMP.func_78750_j(PlayerControllerMP.java:344) at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:317) -- Affected level -- Details: Level name: MpServer All players: 0 total; [] Chunk stats: MultiplayerChunkCache: 0, 0 Level seed: 0 Level generator: ID 00 - default, ver 1. Features enabled: false Level generator options: Level spawn location: 8.00,64.00,8.00 - World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511) Level time: 0 game time, 0 day time Level dimension: 0 Level storage version: 0x00000 - Unknown? Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false) Level game mode: Game mode: spectator (ID 3). Hardcore: false. Cheats: false Forced entities: 0 total; [] Retry entities: 0 total; [] Server brand: ~~ERROR~~ NullPointerException: null Server type: Non-integrated multiplayer server Stacktrace: at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:351) at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2502) at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:374) at net.minecraft.client.main.Main.main(SourceFile:120) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) at net.minecraft.launchwrapper.Launch.main(Launch.java:28) -- System Details -- Details: Minecraft Version: 1.8 Operating System: Windows 7 (amd64) version 6.1 Java Version: 1.8.0_25, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 2206996624 bytes (2104 MB) / 2562719744 bytes (2444 MB) up to 7635730432 bytes (7282 MB) JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8G IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95 FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1450 11 mods loaded, 11 mods active States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored UCHIJA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) UCHIJA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.3.1450.jar) UCHIJA Forge{11.14.3.1450} [Minecraft Forge] (forge-1.8-11.14.3.1450.jar) UCHIJA replaymod-replay{1.8-2.0.0-b4} [Replay Mod - Replay] (replaymod-1.8-2.0.0-b4.jar) UCHIJA replaymod-simplepathing{1.8-2.0.0-b4} [Replay Mod - Simple Pathing] (replaymod-1.8-2.0.0-b4.jar) UCHIJA replaymod-extras{1.8-2.0.0-b4} [Replay Mod - Extras] (replaymod-1.8-2.0.0-b4.jar) UCHIJA replaymod-recording{1.8-2.0.0-b4} [Replay Mod - Recording] (replaymod-1.8-2.0.0-b4.jar) UCHIJA replaymod-online{1.8-2.0.0-b4} [Replay Mod - Online] (replaymod-1.8-2.0.0-b4.jar) UCHIJA replaymod{1.8-2.0.0-b4} [Replay Mod] (replaymod-1.8-2.0.0-b4.jar) UCHIJA replaymod-compat{1.8-2.0.0-b4} [Replay Mod - Compatibility] (replaymod-1.8-2.0.0-b4.jar) UCHIJA replaymod-render{1.8-2.0.0-b4} [Replay Mod - Render] (replaymod-1.8-2.0.0-b4.jar) Loaded coremods (and transformers): LoadingPlugin (replaymod-1.8-2.0.0-b4.jar) GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 368.22' Renderer: 'GeForce GTX 660/PCIe/SSE2' Launched Version: 1.8-Forge11.14.3.1450 LWJGL: 2.9.1 OpenGL: GeForce GTX 660/PCIe/SSE2 GL version 4.5.0 NVIDIA 368.22, NVIDIA Corporation GL Caps: Using GL 1.3 multitexturing. Using GL 1.3 texture combiners. Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported. Shaders are available because OpenGL 2.1 is supported. VBOs are available because OpenGL 1.5 is supported. Using VBOs: Yes Is Modded: Definitely; Client brand changed to 'fml,forge' Type: Client (map_client.txt) Resource Packs: [] Current Language: English (US) Profiler Position: N/A (disabled)