I don't know the problem, I updated the api to 0.30.0 but it is giving me an issue.

Could you provide game logs. That's why it's part of the bug report

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

Time: 3/4/21 8:56 AM
Description: Rendering screen

org.spongepowered.asm.mixin.injection.throwables.InjectionError: LVT in net/minecraft/class_757::method_3192(FJZ)V has incompatible changes at opcode 593 in callback net/minecraft/class_757::onBeforeRenderScreen.
Expected: [I, I, Lnet/minecraft/class_4587;]
Found: [I, Lnet/minecraft/class_1041;]
at net.minecraft.class_757.handler$zpa000$onBeforeRenderScreen$missing(class_757.java)
at net.minecraft.class_757.method_3192(class_757.java:824)
at net.minecraft.class_310.method_1523(class_310.java:1048)
at net.minecraft.class_310.method_1514(class_310.java:681)
at net.minecraft.client.main.Main.main(Main.java:215)
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.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:226)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:139)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:27)

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

-- Head --
Thread: Render thread
Stacktrace:
at net.minecraft.class_757.handler$zpa000$onBeforeRenderScreen$missing(class_757.java)

-- Screen render details --
Details:
Screen name: net.minecraft.class_442
Mouse location: Scaled: (162, 48). Absolute: (324.000000, 96.000000)
Screen size: Scaled: (427, 240). Absolute: (854, 480). Scale factor of 2.000000
Stacktrace:
at net.minecraft.class_757.method_3192(class_757.java:824)
at net.minecraft.class_310.method_1523(class_310.java:1048)
at net.minecraft.class_310.method_1514(class_310.java:681)
at net.minecraft.client.main.Main.main(Main.java:215)
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.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:226)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:139)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:27)

-- System Details --
Details:
Minecraft Version: 1.16.4
Minecraft Version ID: 1.16.4
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: 664244800 bytes (633 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
CPUs: 12
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
Fabric Mods:
adventurez: AdventureZ 1.1.4
amecsapi: Amecs API 1.1.1+mc1.16-rc1
autoconfig1u: Auto Config v1 Updated 3.3.1
backslot: BackSlot 1.1.8
bebooks: Better Enchanted Books 1.1.4
betterend: Better End 0.8.8-beta
blue_endless_jankson: jankson 1.2.0
byg: BYG 1.1.3
cardinal-components-base: Cardinal Components API (base) 2.7.1
cardinal-components-entity: Cardinal Components API (entities) 2.7.1
chainmail: Chainmail 0.5.0
cloth-basic-math: Cloth Basic Math 0.5.1
cloth-client-events-v0: Cloth Client Events v0 1.4.5
cloth-config2: Cloth Config v4 4.8.3
diggusmaximus: Diggus Maximus 1.4.2-1.16.3
easiervillagertrading: EasierVillagerTrading 1.16.4-fabric0.25.1-1.5.3
enhancement: Enhancement (Fabric) 0.2.1
expandedstorage: ExpandedStorage 5.6.31
extraorigins: Extra Origins 1.16.4-6
fabric: Fabric API 0.30.0+1.16
fabric-api-base: Fabric API Base 0.2.0+daa38b3d7d
fabric-biome-api-v1: Fabric Biome API (v1) 3.1.1+ca58154a7d
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.5+ca58154a7d
fabric-command-api-v1: Fabric Command API (v1) 1.0.10+ca58154a7d
fabric-commands-v0: Fabric Commands (v0) 0.2.2+ca58154a7d
fabric-containers-v0: Fabric Containers (v0) 0.1.10+ca58154a7d
fabric-content-registries-v0: Fabric Content Registries (v0) 0.2.1+ca58154a7d
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.3+ca58154a7d
fabric-dimensions-v1: fabric-dimensions-v1 2.0.2+ca58154a7d
fabric-entity-events-v1: Fabric Entity Events (v1) 1.0.3+ca58154a7d
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.4.2+ca58154a7d
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.1+ca58154a7d
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.6+ca58154a7d
fabric-item-api-v1: Fabric Item API (v1) 1.2.1+ca58154a7d
fabric-item-groups-v0: Fabric Item Groups (v0) 0.2.3+ca58154a7d
fabric-key-binding-api-v1: Fabric Key Binding API (v1) 1.0.2+ca58154a7d
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.2.1+ca58154a7d
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 1.2.1+ca58154a7d
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.0.2+ca58154a7d
fabric-mining-levels-v0: Fabric Mining Levels (v0) 0.1.3+ca58154a7d
fabric-models-v0: Fabric Models (v0) 0.2.1+ca58154a7d
fabric-networking-api-v1: Fabric Networking API (v1) 1.0.1+ca58154a7d
fabric-networking-blockentity-v0: Fabric Networking Block Entity (v0) 0.2.8+ca58154a7d
fabric-networking-v0: Fabric Networking (v0) 0.3.2+ca58154a7d
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 1.9.3+ca58154a7d
fabric-object-builders-v0: Fabric Object Builders (v0) 0.7.2+ca58154a7d
fabric-particles-v1: Fabric Particles (v1) 0.2.4+ca58154a7d
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.7.4+ca58154a7d
fabric-renderer-api-v1: Fabric Renderer API (v1) 0.4.1+ca58154a7d
fabric-renderer-indigo: Fabric Renderer - Indigo 0.4.4+ca58154a7d
fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 2.2.1+ca58154a7d
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.1.5+ca58154a7d
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.13+ca58154a7d
fabric-rendering-v0: Fabric Rendering (v0) 1.1.2+ca58154a7d
fabric-rendering-v1: Fabric Rendering (v1) 1.5.1+ca58154a7d
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.4.2+ca58154a7d
fabric-screen-api-v1: Fabric Screen API (v1) 1.0.0+c045166c7d
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.1.1+ca58154a7d
fabric-structure-api-v1: Fabric Structure API (v1) 1.1.4+ca58154a7d
fabric-tag-extensions-v0: Fabric Tag Extensions (v0) 1.1.1+ca58154a7d
fabric-textures-v0: Fabric Textures (v0) 1.0.6+ca58154a7d
fabric-tool-attribute-api-v1: Fabric Tool Attribute API (v1) 1.2.6+ca58154a7d
fabricloader: Fabric Loader 0.11.1
fallflyinglib: FallFlyingLib 1.1.0
fiber: fiber 0.23.0-2
gateofbabylon: Gate Of Babylon 1.2.0-1.16.2
inventorysorter: Inventory Sorter 1.7.6-1.16
jankson: Jankson 3.0.1+j1.2.0
java: Java HotSpot(TM) 64-Bit Server VM 8
kyrptconfig: Kytpt Config 1.1.6-1.16
libgui: LibGui 3.3.2+1.16.4
minecraft: Minecraft 1.16.4
mm: Manningham Mills 2.1
modmenu: Mod Menu 1.14.13+build.19
optifabric: OptiFabric 1.8.16
origins: Origins 0.4.6
origins-classes: Origins: Classes 1.1.1
patchouli: Patchouli 1.16.4-50-FABRIC
pehkui: Pehkui 1.6.2+1.16.3
polymorph: Polymorph 0.0.5-1.16.3
reach-entity-attributes: Reach Entity Attribute 1.0.1
reroll: Reroll 1.1.0-1.16.4
roughlyenoughitems: Roughly Enough Items 5.8.10
roughlyenoughitems-api: REI (API) 5.8.10
roughlyenoughitems-default-plugin: REI (Default Plugin) 5.8.10
roughlyenoughitems-runtime: REI (Runtime) 5.8.10
tk_valoeghese_zoesteriaconfig: ZoesteriaConfig 1.3.2
waystones: Waystones 1.1.1.1
Patchouli open book context: n/a
Launched Version: fabric-loader-0.11.1-1.16.4
Backend library: LWJGL version 3.2.2 build 10
Backend API: Radeon RX 570 Series GL version 4.6.14757 Compatibility Profile Context 20.12.1 27.20.14501.28009, ATI Technologies Inc.
GL Caps: Using framebuffer using OpenGL 3.0
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
Graphics mode: fancy
Resource Packs: vanilla, file/RTX+16x+for+Java+v4.1.zip
Current Language: English (US)
CPU: 12x AMD Ryzen 5 2600 Six-Core Processor
OptiFine Version: OptiFine_1.16.4_HD_U_G5
OptiFine Build: 20201106-171901
Render Distance Chunks: 6
Mipmaps: 0
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: BSL_v7.2.01pre2.zip
OpenGlVersion: 4.6.14757 Compatibility Profile Context 20.12.1 27.20.14501.28009
OpenGlRenderer: Radeon RX 570 Series
OpenGlVendor: ATI Technologies Inc.
CpuCount: 12

-- OptiFabric --
Details:
OptiFine jar designed for: 1.16.4
OptiFine jar version: OptiFine_1.16.4_HD_U_G5
OptiFine jar status: Valid OptiFine installer
OptiFine remapped jar: C:\Users\Kenny\AppData\Roaming.minecraft.optifine\OptiFine_1.16.4_HD_U_G5\Optifine-mapped.jar
OptiFabric error:

remove optifabric/optifine

Basically the entire log when i try to load into a server with the mod installed(FABRIC)
Log: https://cdn.discordapp.com/attachments/816261459817267260/817508640549896222/image0.jpg

Any fix? Im using aternos and the mods i have installed are:
architectury-1.8.130-fabric.jar
autoconfig1u-3.3.1.jar
fabric-api-0.31.0+1.16.jar
FallingTree-Fabric-1.16.5-2.10.2.jar
lithium-fabric-mc1.16.5-0.6.4.jar
netherite-plus-mod-1.3.17-1.16.5-fabric.jar
Origins-1.16.5-0.5.2.jar

@UnhappyEnderman you need the mods client side. also create a new issue

So do i not need them installed on the server? Sry im new to this im not exactly sure what client side/server side means.

if you have a mod server side that adds blocks, you need it client side as well. please create a new issue