Exception in server tick loop

[Draws]

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 8/11/21, 3:16 PM
Description: Exception in server tick loop

net.minecraftforge.fml.util.ObfuscationReflectionHelper$UnableToFindFieldException: java.lang.NoSuchFieldException: backgroundColor
    at net.minecraftforge.fml.util.ObfuscationReflectionHelper.findField(ObfuscationReflectionHelper.java:241) ~[fmlcore-1.17.1-37.0.22.jar%2358!:?] {}
    at net.minecraftforge.fml.util.ObfuscationReflectionHelper.getPrivateValue(ObfuscationReflectionHelper.java:86) ~[fmlcore-1.17.1-37.0.22.jar%2358!:?] {}
    at net.silentchaos512.gems.soul.Soul.getEggPrimaryColor(Soul.java:180) ~[silents-gems-1.17.1-4.1.0.jar%2355!:4.1.0] {re:classloading}
    at net.silentchaos512.gems.soul.Soul.<init>(Soul.java:59) ~[silents-gems-1.17.1-4.1.0.jar%2355!:4.1.0] {re:classloading}
    at net.silentchaos512.gems.soul.Soul$Events.onServerAboutToStart(Soul.java:215) ~[silents-gems-1.17.1-4.1.0.jar%2355!:4.1.0] {re:classloading}
    at net.minecraftforge.eventbus.ASMEventHandler_17_Events_onServerAboutToStart_FMLServerStartingEvent.invoke(.dynamic) ~[?:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-5.0.3.jar%232!:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-5.0.3.jar%232!:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-5.0.3.jar%232!:?] {}
    at net.minecraftforge.fmllegacy.server.ServerLifecycleHooks.handleServerStarting(ServerLifecycleHooks.java:101) ~[forge-1.17.1-37.0.22-universal.jar%2361!:?] {re:classloading}
    at net.minecraft.client.server.IntegratedServer.m_7038_(IntegratedServer.java:67) ~[client-1.17.1-20210706.113038-srg.jar%2357!:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:659) ~[client-1.17.1-20210706.113038-srg.jar%2357!:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.m_177918_(MinecraftServer.java:258) ~[client-1.17.1-20210706.113038-srg.jar%2357!:?] {re:classloading,pl:accesstransformer:B}
    at java.lang.Thread.run(Thread.java:831) [?:?] {}
Caused by: java.lang.NoSuchFieldException: backgroundColor
    at java.lang.Class.getDeclaredField(Class.java:2549) ~[?:?] {}
    at net.minecraftforge.fml.util.ObfuscationReflectionHelper.findField(ObfuscationReflectionHelper.java:235) ~[fmlcore-1.17.1-37.0.22.jar%2358!:?] {}
    ... 13 more

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

-- System Details --
Details:
    Minecraft Version: 1.17.1
    Minecraft Version ID: 1.17.1
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 16.0.1, Microsoft
    Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
    Memory: 1010254624 bytes (963 MiB) / 2013265920 bytes (1920 MiB) up to 2147483648 bytes (2048 MiB)
    CPUs: 8
    Processor Vendor: GenuineIntel
    Processor Name: Intel(R) Core(TM) i7-4800MQ CPU @ 2.70GHz
    Identifier: Intel64 Family 6 Model 60 Stepping 3
    Microarchitecture: Haswell (Client)
    Frequency (GHz): 2.69
    Number of physical packages: 1
    Number of physical CPUs: 4
    Number of logical CPUs: 8
    Graphics card #0 name: NVIDIA Quadro K2100M
    Graphics card #0 vendor: NVIDIA (0x10de)
    Graphics card #0 VRAM (MB): 2048.00
    Graphics card #0 deviceId: 0x11fc
    Graphics card #0 versionInfo: DriverVersion=25.21.14.2625
    Memory slot #0 capacity (MB): 4096.00
    Memory slot #0 clockSpeed (GHz): 1.60
    Memory slot #0 type: DDR3
    Memory slot #1 capacity (MB): 4096.00
    Memory slot #1 clockSpeed (GHz): 1.60
    Memory slot #1 type: DDR3
    Memory slot #2 capacity (MB): 4096.00
    Memory slot #2 clockSpeed (GHz): 1.60
    Memory slot #2 type: DDR3
    Memory slot #3 capacity (MB): 4096.00
    Memory slot #3 clockSpeed (GHz): 1.60
    Memory slot #3 type: DDR3
    Virtual memory max (MB): 20923.11
    Virtual memory used (MB): 17785.20
    Swap memory total (MB): 4608.00
    Swap memory used (MB): 636.66
    JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
    Player Count: 0 / 8; []
    Data Packs: vanilla, mod:morejewels, mod:survivalplus, mod:forge (incompatible), mod:silentlib, mod:silentgear, mod:silentgems
    Type: Integrated Server (map_client.txt)
    Is Modded: Definitely; Client brand changed to 'forge'
    ModLauncher: 9.0.7+91+master.8569cdf
    ModLauncher launch target: forgeclient
    ModLauncher naming: srg
    ModLauncher services: 
         eventbus PLUGINSERVICE 
         object_holder_definalize PLUGINSERVICE 
         runtime_enum_extender PLUGINSERVICE 
         capability_inject_definalize PLUGINSERVICE 
         accesstransformer PLUGINSERVICE 
         runtimedistcleaner PLUGINSERVICE 
         fml TRANSFORMATIONSERVICE 
    FML Language Providers: 
        minecraft@1.0
        javafml@null
    Mod List: 
        client-1.17.1-20210706.113038-srg.jar             |Minecraft                     |minecraft                     |1.17.1              |DONE      |Manifest: NOSIGNATURE
        MoreJewels-v2.9.3-1.17.1.jar                      |More Jewels                   |morejewels                    |2.9.3               |DONE      |Manifest: NOSIGNATURE
        SurvivalPlus-1.17.1-0.1.5.jar                     |SurvivalPlus                  |survivalplus                  |0.1.5               |DONE      |Manifest: NOSIGNATURE
        forge-1.17.1-37.0.22-universal.jar                |Forge                         |forge                         |37.0.22             |DONE      |Manifest: 22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90
        silent-lib-1.17.1-5.0.0.jar                       |Silent Lib                    |silentlib                     |5.0.0               |DONE      |Manifest: NOSIGNATURE
        silent-gear-1.17.1-2.7.0.jar                      |Silent Gear                   |silentgear                    |2.7.0               |DONE      |Manifest: NOSIGNATURE
        silents-gems-1.17.1-4.1.0.jar                     |Silent's Gems: Base           |silentgems                    |4.1.0               |DONE      |Manifest: NOSIGNATURE
    Crash Report UUID: 66b974a5-4cf3-4f0b-8994-e77f82ec1256
    FML: 37.0
    Forge: net.minecraftforge:37.0.22

[diesieben07]

Seems to be a problem with Silent Gems.