Illegal Access Error: Forge 1.14.4

[PastelleRose]

I am trying to switch from forge 1.12.2 (due to loading errors) to forge 1.14.4. When opening the game to test it, I got an "Unexpected Error" message. Here's the full crash report, in the spoiler:

 

Spoiler

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 4/5/20 5:02 PM
Description: Unexpected error

java.lang.IllegalAccessError: tried to access method net.minecraft.client.renderer.model.BlockPart$Deserializer.<init>()V from class net.minecraftforge.client.model.ModelLoaderRegistry2$ExpandedBlockModelDeserializer
    at net.minecraftforge.client.model.ModelLoaderRegistry2$ExpandedBlockModelDeserializer.<clinit>(ModelLoaderRegistry2.java:520) ~[?:?] {re:classloading}
    at net.minecraft.client.renderer.model.BlockModel.func_178307_a(BlockModel.java:59) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.model.BlockModel.func_178294_a(BlockModel.java:63) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.model.ModelBakery.<clinit>(ModelBakery.java:85) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.tileentity.TileEntityRenderer.<clinit>(TileEntityRenderer.java:21) ~[?:?] {re:classloading,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.<init>(TileEntityRendererDispatcher.java:55) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.<clinit>(TileEntityRendererDispatcher.java:44) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.renderer.GameRenderer.func_195458_a(GameRenderer.java:532) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_195542_b(Minecraft.java:890) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:384) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.client.main.Main.main(SourceFile:155) [?:?] {re:classloading}
    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-1.14.4-28.2.2.jar:28.2] {}
    at net.minecraftforge.fml.loading.FMLClientLaunchProvider$$Lambda$383/1609086753.call(Unknown Source) [forge-1.14.4-28.2.2.jar:28.2] {}
    at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:37) [modlauncher-4.1.0.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:54) [modlauncher-4.1.0.jar:?] {}
    at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:72) [modlauncher-4.1.0.jar:?] {}
    at cpw.mods.modlauncher.Launcher.run(Launcher.java:81) [modlauncher-4.1.0.jar:?] {}
    at cpw.mods.modlauncher.Launcher.main(Launcher.java:65) [modlauncher-4.1.0.jar:?] {}

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

-- System Details --
Details:
    Minecraft Version: 1.14.4
    Minecraft Version ID: 1.14.4
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 1534580504 bytes (1463 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
    CPUs: 16
    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
    ModLauncher: 4.1.0+62+5bfa59b
    ModLauncher launch target: fmlclient
    ModLauncher naming: srg
    ModLauncher services: 
        /eventbus-1.0.0-service.jar eventbus PLUGINSERVICE 
        /forge-1.14.4-28.2.2.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.14.4-28.2.2.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-1.0.5-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.14.4-28.2.2.jar capability_inject_definalize PLUGINSERVICE 
        /forge-1.14.4-28.2.2.jar runtimedistcleaner PLUGINSERVICE 
        /forge-1.14.4-28.2.2.jar fml TRANSFORMATIONSERVICE 
    FML: 28.2
    Forge: net.minecraftforge:28.2.2
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        forge-1.14.4-28.2.2-client.jar Minecraft {[email protected] COMMON_SETUP}
        forge-1.14.4-28.2.2-universal.jar Forge {[email protected] COMMON_SETUP}
    Launched Version: 1.14.4-forge-28.2.2
    LWJGL: 3.2.2 build 10
    OpenGL: GeForce GTX 1070/PCIe/SSE2 GL version 4.6.0 NVIDIA 445.75, 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 'forge'
    Type: Client (map_client.txt)
    Resource Packs: 
    Current Language: English (US)
    CPU: 16x AMD Ryzen 7 2700X Eight-Core Processor 

 I would really appreciate any help!