The mod works perfectly until I try to use Prev. Robe Power or Next Robe Power, in which it immediately crashes and I get the 255 exit code for an "Unexpected error." This problem has persisted across profiles, from Star Wars Conquest to a profile with just Biomes O'Plenty, PSWM, and Legends. Below is the full crash report:

 

Description: Unexpected error

java.lang.NullPointerException: Unexpected error
    at com.parzivail.pswm.handlers.CommonEventHandler.onKeyInput(CommonEventHandler.java:302)
    at cpw.mods.fml.common.eventhandler.ASMEventHandler_281_CommonEventHandler_onKeyInput_KeyInputEvent.invoke(.dynamic)
    at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
    at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
    at cpw.mods.fml.common.FMLCommonHandler.fireKeyInput(FMLCommonHandler.java:540)
    at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1873)
    at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
    at net.minecraft.client.main.Main.main(SourceFile:148)
    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:498)
    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 com.parzivail.pswm.handlers.CommonEventHandler.onKeyInput(CommonEventHandler.java:302)
    at cpw.mods.fml.common.eventhandler.ASMEventHandler_281_CommonEventHandler_onKeyInput_KeyInputEvent.invoke(.dynamic)
    at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
    at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
    at cpw.mods.fml.common.FMLCommonHandler.fireKeyInput(FMLCommonHandler.java:540)

-- Affected level --
Details:
    Level name: MpServer
    All players: 1 total; [EntityClientPlayerMP['Lezbndogmom'/331, l='MpServer', x=920.24, y=72.62, z=474.99]]
    Chunk stats: MultiplayerChunkCache: 620, 620
    Level seed: 0
    Level generator: ID 04 - BIOMESOP, ver 0. Features enabled: false
    Level generator options: 
    Level spawn location: World: (988,64,404), Chunk: (at 12,4,4 in 61,25; contains blocks 976,0,400 to 991,255,415), Region: (1,0; contains chunks 32,0 to 63,31, blocks 512,0,0 to 1023,255,511)
    Level time: 27342 game time, 27342 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: creative (ID 1). Hardcore: false. Cheats: false
    Forced entities: 65 total; [EntitySpider['Spider'/128, l='MpServer', x=909.28, y=12.00, z=426.22], EntityPig['Pig'/129, l='MpServer', x=899.06, y=71.00, z=421.88], EntityPig['Pig'/130, l='MpServer', x=907.09, y=71.00, z=459.25], EntityPig['Pig'/131, l='MpServer', x=909.50, y=67.38, z=479.47], EntityPig['Pig'/132, l='MpServer', x=900.97, y=70.00, z=466.94], EntityPig['Pig'/133, l='MpServer', x=896.34, y=70.00, z=481.88], EntityCow['Cow'/134, l='MpServer', x=911.50, y=64.00, z=519.50], EntityCow['Cow'/135, l='MpServer', x=908.50, y=64.00, z=515.50], EntityZombie['Zombie'/151, l='MpServer', x=925.50, y=27.00, z=407.03], EntityZombie['Zombie'/152, l='MpServer', x=920.97, y=27.00, z=403.47], EntityBat['Bat'/153, l='MpServer', x=919.75, y=31.12, z=404.56], EntityZombie['Zombie'/154, l='MpServer', x=914.00, y=12.00, z=427.31], EntitySpider['Spider'/155, l='MpServer', x=912.59, y=12.00, z=427.91], EntityCow['Cow'/156, l='MpServer', x=916.53, y=71.00, z=507.50], EntityCow['Cow'/157, l='MpServer', x=915.19, y=70.00, z=510.50], EntitySkeleton['Skeleton'/159, l='MpServer', x=931.48, y=22.00, z=398.59], EntityCow['Cow'/160, l='MpServer', x=938.44, y=74.00, z=423.50], EntityCow['Cow'/161, l='MpServer', x=924.53, y=72.00, z=509.38], EntityCow['Cow'/162, l='MpServer', x=923.09, y=72.00, z=493.78], EntityCow['Cow'/163, l='MpServer', x=941.25, y=69.00, z=524.53], EntityCow['Cow'/164, l='MpServer', x=957.50, y=73.00, z=428.50], EntityCow['Cow'/165, l='MpServer', x=950.06, y=72.00, z=428.69], EntityPig['Pig'/166, l='MpServer', x=951.47, y=66.00, z=526.53], EntityCow['Cow'/169, l='MpServer', x=978.47, y=72.00, z=418.50], EntityPig['Pig'/170, l='MpServer', x=965.97, y=71.00, z=508.94], EntityPig['Pig'/171, l='MpServer', x=963.19, y=66.00, z=523.53], EntityPig['Pig'/172, l='MpServer', x=952.94, y=66.00, z=527.06], EntityPig['Pig'/173, l='MpServer', x=972.72, y=65.00, z=522.13], EntityPig['Pig'/174, l='MpServer', x=973.63, y=65.00, z=525.25], EntityPig['Pig'/175, l='MpServer', x=960.94, y=66.00, z=539.06], EntityPig['Pig'/176, l='MpServer', x=973.50, y=68.00, z=543.22], EntityPig['Pig'/178, l='MpServer', x=970.31, y=69.00, z=552.50], VehicSnowspeeder['T-47 Snowspeeder'/187, l='MpServer', x=988.00, y=65.00, z=404.00], EntityPig['Pig'/188, l='MpServer', x=987.31, y=73.00, z=502.53], EntityPig['Pig'/189, l='MpServer', x=988.31, y=71.00, z=523.50], EntityPig['Pig'/190, l='MpServer', x=985.50, y=70.00, z=539.69], EntityPig['Pig'/191, l='MpServer', x=981.53, y=65.00, z=528.67], EntityZombie['Zombie'/63, l='MpServer', x=848.50, y=54.00, z=397.34], EntityPig['Pig'/192, l='MpServer', x=980.24, y=64.92, z=529.98], EntityBat['Bat'/64, l='MpServer', x=842.91, y=53.00, z=410.03], EntityZombie['Zombie'/65, l='MpServer', x=853.47, y=37.00, z=417.97], EntityPig['Pig'/193, l='MpServer', x=982.82, y=63.00, z=555.07], EntitySkeleton['Skeleton'/66, l='MpServer', x=857.50, y=39.00, z=523.50], EntityCow['Cow'/67, l='MpServer', x=845.97, y=64.00, z=533.28], EntityCow['Cow'/68, l='MpServer', x=848.97, y=64.00, z=537.63], EntityCow['Cow'/69, l='MpServer', x=853.28, y=64.00, z=553.72], EntityPig['Pig'/199, l='MpServer', x=998.69, y=74.00, z=518.50], EntityPig['Pig'/71, l='MpServer', x=849.88, y=64.00, z=551.59], EntityPig['Pig'/200, l='MpServer', x=997.47, y=77.00, z=514.31], EntityPig['Pig'/201, l='MpServer', x=998.47, y=64.00, z=528.92], EntityPig['Pig'/92, l='MpServer', x=874.50, y=69.00, z=437.56], EntityCow['Cow'/93, l='MpServer', x=867.19, y=65.00, z=540.84], EntityCow['Cow'/94, l='MpServer', x=865.22, y=64.00, z=536.59], EntityCow['Cow'/95, l='MpServer', x=879.75, y=65.00, z=540.66], EntityCow['Cow'/96, l='MpServer', x=864.47, y=63.00, z=555.69], EntityClientPlayerMP['Lezbndogmom'/331, l='MpServer', x=920.24, y=72.62, z=474.99], EntityCreeper['Creeper'/110, l='MpServer', x=884.72, y=15.00, z=398.97], EntityCreeper['Creeper'/111, l='MpServer', x=896.50, y=15.00, z=403.63], EntitySkeleton['Skeleton'/112, l='MpServer', x=882.50, y=61.00, z=408.50], EntitySkeleton['Skeleton'/113, l='MpServer', x=884.56, y=61.00, z=409.06], EntityPig['Pig'/114, l='MpServer', x=886.55, y=71.00, z=436.05], EntityPig['Pig'/115, l='MpServer', x=887.47, y=70.00, z=433.31], EntityCow['Cow'/116, l='MpServer', x=891.53, y=68.00, z=507.13], EntitySkeleton['Skeleton'/126, l='MpServer', x=897.47, y=14.00, z=411.16], EntitySkeleton['Skeleton'/127, l='MpServer', x=897.47, y=14.00, z=409.97]]
    Retry entities: 0 total; []
    Server brand: fml,forge
    Server type: Integrated singleplayer server
Stacktrace:
    at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
    at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2444)
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:927)
    at net.minecraft.client.main.Main.main(SourceFile:148)
    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:498)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
    Minecraft Version: 1.7.10
    Operating System: Mac OS X (x86_64) version 10.16
    Java Version: 1.8.0_74, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 685634136 bytes (653 MB) / 1928331264 bytes (1839 MB) up to 3817865216 bytes (3641 MB)
    JVM Flags: 2 total; -Xmx4096m -Xms256m
    AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 95
    FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1614 7 mods loaded, 7 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{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1614-1.7.10.jar) 
    UCHIJAAAA    Forge{10.13.4.1614} [Minecraft Forge] (forge-1.7.10-10.13.4.1614-1.7.10.jar) 
    UCHIJAAAA    legends{8.6.2} [Legends Mod] (1Legends-1.7.10-8.6.2.jar) 
    UCHIJAAAA    BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.2308-universal.jar) 
    UCHIJAAAA    notenoughIDs{1.4.3.5} [NotEnoughIDs] (NotEnoughIDs-1.4.3.5.jar) 
    UCHIJAAAA    starwarsmod{1.3.7} [Parzi's Star Wars Mod] (Parzi's Star Wars Mod v1.3.7.jar) 
    GL info: ' Vendor: 'ATI Technologies Inc.' Version: '2.1 ATI-4.8.101' Renderer: 'AMD Radeon HD - FirePro D500 OpenGL Engine'
    Launched Version: forge-10.13.4.1614
    LWJGL: 2.9.1
    OpenGL: AMD Radeon HD - FirePro D500 OpenGL Engine GL version 2.1 ATI-4.8.101, ATI Technologies Inc.
    GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

    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)
    Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    Anisotropic Filtering: Off (1)

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Please update to a modern version of Minecraft to receive support.

Currently supported versions are 1.19.3 (Latest), 1.19.2, and 1.18.2 (LTS).