This is the only mod I have installed currently on Forge (1.15.2-forge-31.1.0). I thought it was conflicting with the other mods I had installed but I took them all out and it's still occurring:

Here is the log report:

[21May2020 00:05:01.392] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher running: args [--username, JoshThePinoy, --version, 1.15.2-forge-31.1.0, --gameDir, C:\Users\joshu\AppData\Roaming.minecraft, --assetsDir, C:\Users\joshu\AppData\Roaming.minecraft\assets, --assetIndex, 1.15, --uuid, dc736e74b3854127a81eed183aef73f8, --accessToken, ????????, --userType, mojang, --versionType, release, --launchTarget, fmlclient, --fml.forgeVersion, 31.1.0, --fml.mcVersion, 1.15.2, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20200122.131323]
[21May2020 00:05:01.395] [main/INFO] [cpw.mods.modlauncher.Launcher/MODLAUNCHER]: ModLauncher 5.0.0-milestone.4+67+b1a340b starting: java version 1.8.0_51 by Oracle Corporation
[21May2020 00:05:01.581] [main/INFO] [net.minecraftforge.fml.loading.FixSSL/CORE]: Added Lets Encrypt root certificates as additional trust
[21May2020 00:05:02.227] [main/INFO] [cpw.mods.modlauncher.LaunchServiceHandler/MODLAUNCHER]: Launching target 'fmlclient' with arguments [--version, 1.15.2-forge-31.1.0, --gameDir, C:\Users\joshu\AppData\Roaming.minecraft, --assetsDir, C:\Users\joshu\AppData\Roaming.minecraft\assets, --uuid, dc736e74b3854127a81eed183aef73f8, --username, JoshThePinoy, --assetIndex, 1.15, --accessToken, ????????, --userType, mojang, --versionType, release]
[21May2020 00:05:03.560] [Render thread/INFO] [net.minecraft.client.Minecraft/]: Setting user: JoshThePinoy
[21May2020 00:05:08.397] [Render thread/INFO] [net.minecraft.client.Minecraft/]: Backend library: LWJGL version 3.2.2 build 10
[21May2020 00:05:09.519] [modloading-worker-9/INFO] [net.minecraftforge.common.ForgeMod/FORGEMOD]: Forge mod loading, version 31.1.0, for MC 1.15.2 with MCP 20200122.131323
[21May2020 00:05:09.519] [modloading-worker-9/INFO] [net.minecraftforge.common.MinecraftForge/FORGE]: MinecraftForge v31.1.0 Initialized
[21May2020 00:05:10.133] [Render thread/ERROR] [net.minecraftforge.fml.javafmlmod.FMLModContainer/]: Exception caught during firing event: net.minecraft.item.MusicDiscItem.(ILjava/util/function/Supplier;Lnet/minecraft/item/Item$Properties;)V
Index: 3
Listeners:
0: NORMAL
1: ASM: class biomesoplenty.init.ModBiomes registerBiomes(Lnet/minecraftforge/event/RegistryEvent$Register;)V
2: ASM: class biomesoplenty.init.ModFeatures registerFeatures(Lnet/minecraftforge/event/RegistryEvent$Register;)V
3: ASM: class biomesoplenty.init.ModItems registerItems(Lnet/minecraftforge/event/RegistryEvent$Register;)V
4: ASM: class biomesoplenty.init.ModSounds registerSounds(Lnet/minecraftforge/event/RegistryEvent$Register;)V
5: ASM: class biomesoplenty.init.ModBlocks registerBlocks(Lnet/minecraftforge/event/RegistryEvent$Register;)V
6: ASM: class biomesoplenty.init.ModEntities registerEntities(Lnet/minecraftforge/event/RegistryEvent$Register;)V
java.lang.NoSuchMethodError: net.minecraft.item.MusicDiscItem.(ILjava/util/function/Supplier;Lnet/minecraft/item/Item$Properties;)V
at biomesoplenty.common.item.MusicDiscItemBOP.(MusicDiscItemBOP.java:32)
at biomesoplenty.init.ModItems.registerItems(ModItems.java:31)
at net.minecraftforge.eventbus.ASMEventHandler_5_ModItems_registerItems_Register.invoke(.dynamic)
at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80)
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258)
at net.minecraftforge.fml.javafmlmod.FMLModContainer.fireEvent(FMLModContainer.java:106)
at net.minecraftforge.fml.javafmlmod.FMLModContainer$$Lambda$2206/1589288513.accept(Unknown Source)
at java.util.function.Consumer.lambda$andThen$14(Consumer.java:65)
at java.util.function.Consumer$$Lambda$2199/812381379.accept(Unknown Source)
at java.util.function.Consumer.lambda$andThen$14(Consumer.java:65)
at java.util.function.Consumer$$Lambda$2199/812381379.accept(Unknown Source)
at net.minecraftforge.fml.ModContainer.transitionState(ModContainer.java:112)
at net.minecraftforge.fml.ModList.lambda$dispatchSynchronousEvent$5(ModList.java:125)
at net.minecraftforge.fml.ModList$$Lambda$2333/1180241360.accept(Unknown Source)
at java.util.ArrayList.forEach(ArrayList.java:1249)
at net.minecraftforge.fml.ModList.dispatchSynchronousEvent(ModList.java:125)
at net.minecraftforge.fml.ModList.lambda$static$1(ModList.java:96)
at net.minecraftforge.fml.ModList$$Lambda$2169/640068149.dispatchEvent(Unknown Source)
at net.minecraftforge.fml.LifecycleEventProvider.dispatch(LifecycleEventProvider.java:71)
at net.minecraftforge.fml.ModLoader.dispatchAndHandleError(ModLoader.java:197)
at net.minecraftforge.fml.ModLoader.lambda$gatherAndInitializeMods$24(ModLoader.java:189)
at net.minecraftforge.fml.ModLoader$$Lambda$2360/4400200.accept(Unknown Source)
at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:964)
at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:189)
at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$2(ClientModLoader.java:97)
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2090/468780345.run(Unknown Source)
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:113)
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2091/507538622.run(Unknown Source)
at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:97)
at net.minecraft.client.Minecraft.(Minecraft.java:393)
at net.minecraft.client.main.Main.main(SourceFile:166)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56)
at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$392/237297104.call(Unknown Source)
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54)
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72)
at cpw.mods.modlauncher.Launcher.run(Launcher.java:81)
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65)

[21May2020 00:05:10.135] [Render thread/ERROR] [net.minecraftforge.fml.javafmlmod.FMLModContainer/LOADING]: Caught exception during event RegistryEvent.Registerminecraft:item dispatch for modid biomesoplenty
java.lang.NoSuchMethodError: net.minecraft.item.MusicDiscItem.(ILjava/util/function/Supplier;Lnet/minecraft/item/Item$Properties;)V
at biomesoplenty.common.item.MusicDiscItemBOP.(MusicDiscItemBOP.java:32) ~[?:?]
at biomesoplenty.init.ModItems.registerItems(ModItems.java:31) ~[?:?]
at net.minecraftforge.eventbus.ASMEventHandler_5_ModItems_registerItems_Register.invoke(.dynamic) ~[?:?]
at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-2.0.0-milestone.1-service.jar:?]
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-2.0.0-milestone.1-service.jar:?]
at net.minecraftforge.fml.javafmlmod.FMLModContainer.fireEvent(FMLModContainer.java:106) [?:31.1]
at net.minecraftforge.fml.javafmlmod.FMLModContainer$$Lambda$2206/1589288513.accept(Unknown Source) [?:31.1]
at java.util.function.Consumer.lambda$andThen$14(Consumer.java:65) [?:1.8.0_51]
at java.util.function.Consumer$$Lambda$2199/812381379.accept(Unknown Source) [?:1.8.0_51]
at java.util.function.Consumer.lambda$andThen$14(Consumer.java:65) [?:1.8.0_51]
at java.util.function.Consumer$$Lambda$2199/812381379.accept(Unknown Source) [?:1.8.0_51]
at net.minecraftforge.fml.ModContainer.transitionState(ModContainer.java:112) [?:?]
at net.minecraftforge.fml.ModList.lambda$dispatchSynchronousEvent$5(ModList.java:125) [?:?]
at net.minecraftforge.fml.ModList$$Lambda$2333/1180241360.accept(Unknown Source) [?:?]
at java.util.ArrayList.forEach(ArrayList.java:1249) [?:1.8.0_51]
at net.minecraftforge.fml.ModList.dispatchSynchronousEvent(ModList.java:125) [?:?]
at net.minecraftforge.fml.ModList.lambda$static$1(ModList.java:96) [?:?]
at net.minecraftforge.fml.ModList$$Lambda$2169/640068149.dispatchEvent(Unknown Source) [?:?]
at net.minecraftforge.fml.LifecycleEventProvider.dispatch(LifecycleEventProvider.java:71) [?:?]
at net.minecraftforge.fml.ModLoader.dispatchAndHandleError(ModLoader.java:197) [?:?]
at net.minecraftforge.fml.ModLoader.lambda$gatherAndInitializeMods$24(ModLoader.java:189) [?:?]
at net.minecraftforge.fml.ModLoader$$Lambda$2360/4400200.accept(Unknown Source) [?:?]
at net.minecraftforge.registries.GameData.fireRegistryEvents(GameData.java:964) [?:?]
at net.minecraftforge.fml.ModLoader.gatherAndInitializeMods(ModLoader.java:189) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.lambda$begin$2(ClientModLoader.java:97) [?:?]
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2090/468780345.run(Unknown Source) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:113) [?:?]
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2091/507538622.run(Unknown Source) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:97) [?:?]
at net.minecraft.client.Minecraft.(Minecraft.java:393) [?:?]
at net.minecraft.client.main.Main.main(SourceFile:166) [?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56) [forge-1.15.2-31.1.0.jar:31.1]
at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$392/237297104.call(Unknown Source) [forge-1.15.2-31.1.0.jar:31.1]
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.0.0-milestone.4.jar:?]
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.0.0-milestone.4.jar:?]
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.0.0-milestone.4.jar:?]
at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.0.0-milestone.4.jar:?]
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.0.0-milestone.4.jar:?]
[21May2020 00:05:10.137] [Render thread/FATAL] [net.minecraftforge.fml.ModLoader/LOADING]: Failed to complete lifecycle event LOAD_REGISTRIES, 1 errors found
[21May2020 00:05:10.137] [Render thread/FATAL] [net.minecraftforge.eventbus.EventBus/EVENTBUS]: EventBus 0 shutting down - future events will not be posted.
java.lang.Exception: stacktrace
at net.minecraftforge.eventbus.EventBus.shutdown(EventBus.java:278) [eventbus-2.0.0-milestone.1-service.jar:?]
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:115) [?:?]
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2091/507538622.run(Unknown Source) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.begin(ClientModLoader.java:97) [?:?]
at net.minecraft.client.Minecraft.(Minecraft.java:393) [?:?]
at net.minecraft.client.main.Main.main(SourceFile:166) [?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
at net.minecraftforge.fml.loading.FMLClientLaunchProvider.lambda$launchService$0(FMLClientLaunchProvider.java:56) [forge-1.15.2-31.1.0.jar:31.1]
at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$392/237297104.call(Unknown Source) [forge-1.15.2-31.1.0.jar:31.1]
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-5.0.0-milestone.4.jar:?]
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-5.0.0-milestone.4.jar:?]
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-5.0.0-milestone.4.jar:?]
at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-5.0.0-milestone.4.jar:?]
at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-5.0.0-milestone.4.jar:?]
[21May2020 00:05:11.105] [Render thread/INFO] [com.mojang.text2speech.NarratorWindows/]: Narrator library for x64 successfully loaded
[21May2020 00:05:11.135] [Render thread/INFO] [net.minecraft.resources.SimpleReloadableResourceManager/]: Reloading ResourceManager: Mod Resources, Default
[21May2020 00:05:12.060] [Server-Worker-1/ERROR] [net.minecraftforge.fml.ModLoader/LOADING]: Skipping lifecycle event SETUP, 1 errors found.
[21May2020 00:05:12.060] [Server-Worker-1/FATAL] [net.minecraftforge.fml.ModLoader/LOADING]: Failed to complete lifecycle event SETUP, 1 errors found
[21May2020 00:05:12.060] [Server-Worker-1/FATAL] [net.minecraftforge.eventbus.EventBus/EVENTBUS]: EventBus 0 shutting down - future events will not be posted.
java.lang.Exception: stacktrace
at net.minecraftforge.eventbus.EventBus.shutdown(EventBus.java:278) [eventbus-2.0.0-milestone.1-service.jar:?]
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:115) [?:?]
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2091/507538622.run(Unknown Source) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.startModLoading(ClientModLoader.java:123) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.lambda$onreload$3(ClientModLoader.java:105) [?:?]
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2676/997361164.run(Unknown Source) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:113) [?:?]
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2091/507538622.run(Unknown Source) [?:?]
at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1618) [?:1.8.0_51]
at java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1610) [?:1.8.0_51]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689) [?:1.8.0_51]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) [?:1.8.0_51]
[21May2020 00:05:13.394] [Server-Worker-5/ERROR] [net.minecraftforge.fml.ModLoader/LOADING]: Skipping lifecycle event ENQUEUE_IMC, 1 errors found.
[21May2020 00:05:13.394] [Server-Worker-5/FATAL] [net.minecraftforge.fml.ModLoader/LOADING]: Failed to complete lifecycle event ENQUEUE_IMC, 1 errors found
[21May2020 00:05:13.395] [Server-Worker-5/FATAL] [net.minecraftforge.eventbus.EventBus/EVENTBUS]: EventBus 0 shutting down - future events will not be posted.
java.lang.Exception: stacktrace
at net.minecraftforge.eventbus.EventBus.shutdown(EventBus.java:278) [eventbus-2.0.0-milestone.1-service.jar:?]
at net.minecraftforge.fml.client.ClientModLoader.lambda$createRunnableWithCatch$5(ClientModLoader.java:115) [?:?]
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2091/507538622.run(Unknown Source) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.finishModLoading(ClientModLoader.java:137) [?:?]
at net.minecraftforge.fml.client.ClientModLoader.lambda$onreload$4(ClientModLoader.java:107) [?:?]
at net.minecraftforge.fml.client.ClientModLoader$$Lambda$2678/966416978.run(Unknown Source) [?:?]
at java.util.concurrent.CompletableFuture.uniRun(CompletableFuture.java:705) [?:1.8.0_51]
at java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:687) [?:1.8.0_51]
at java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:443) [?:1.8.0_51]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_51]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689) [?:1.8.0_51]
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) [?:1.8.0_51]
[21May2020 00:05:13.497] [Render thread/INFO] [net.minecraft.client.audio.SoundSystem/]: OpenAL initialized.
[21May2020 00:05:13.497] [Render thread/INFO] [net.minecraft.client.audio.SoundEngine/SOUNDS]: Sound engine started
[21May2020 00:05:13.634] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 1024x512x4 minecraft:textures/atlas/blocks.png-atlas
[21May2020 00:05:13.659] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 128x128x4 minecraft:textures/atlas/signs.png-atlas
[21May2020 00:05:13.659] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 512x512x4 minecraft:textures/atlas/banner_patterns.png-atlas
[21May2020 00:05:13.660] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 512x512x4 minecraft:textures/atlas/shield_patterns.png-atlas
[21May2020 00:05:13.661] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 256x256x4 minecraft:textures/atlas/chest.png-atlas
[21May2020 00:05:13.661] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 512x256x4 minecraft:textures/atlas/beds.png-atlas
[21May2020 00:05:13.661] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 512x256x4 minecraft:textures/atlas/shulker_boxes.png-atlas
[21May2020 00:05:13.999] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 256x256x0 minecraft:textures/atlas/particles.png-atlas
[21May2020 00:05:14.001] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 256x256x0 minecraft:textures/atlas/paintings.png-atlas
[21May2020 00:05:14.001] [Render thread/INFO] [net.minecraft.client.renderer.texture.AtlasTexture/]: Created: 128x128x0 minecraft:textures/atlas/mob_effects.png-atlas

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