When I try to use the tent bag, the game crashes and the main error is shown:
"java.lang.NoSuchFieldError: field_20954".

Alongside this, the rope bridge posts and the rope bridge is completely invisible.

The full crash log is as follows:

Description: Unexpected error

java.lang.NoSuchFieldError: field_20954
at com.terraformersmc.campanion.client.util.TentPreviewImmediate.method_22994(TentPreviewImmediate.java:32)
at net.minecraft.class_4597$class_4598.getBuffer(class_4597.java:55)
at com.terraformersmc.campanion.client.renderer.item.BuiltTentItemRenderer.renderFakeBlock(BuiltTentItemRenderer.java:47)
at net.minecraft.class_761.handler$zfb000$render(class_761.java:3516)
at net.minecraft.class_761.method_22710(class_761.java:1502)
at net.minecraft.class_757.method_3188(class_757.java:996)
at net.minecraft.class_757.method_3192(class_757.java:688)
at net.minecraft.class_310.method_1523(class_310.java:989)
at net.minecraft.class_310.method_1514(class_310.java:619)
at net.minecraft.client.main.Main.main(Main.java:204)
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:192)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)

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

-- Head --
Thread: Render thread
Stacktrace:
at com.terraformersmc.campanion.client.util.TentPreviewImmediate.method_22994(TentPreviewImmediate.java:32)
at net.minecraft.class_4597$class_4598.getBuffer(class_4597.java:55)
at com.terraformersmc.campanion.client.renderer.item.BuiltTentItemRenderer.renderFakeBlock(BuiltTentItemRenderer.java:47)
at net.minecraft.class_761.handler$zfb000$render(class_761.java:3516)
at net.minecraft.class_761.method_22710(class_761.java:1502)
at net.minecraft.class_757.method_3188(class_757.java:996)

-- Affected level --
Details:
All players: 1 total; [class_746['SpackeryPlums'/194, l='MpServer', x=835.07, y=103.00, z=300.40]]
Chunk stats: Client Chunks (ImmPtl) 289
Level dimension: minecraft:overworld
Level name: MpServer
Level seed: 8935535660802466792
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options: {}
Level spawn location: World: (176,64,192), Chunk: (at 0,4,0 in 11,12; contains blocks 176,0,192 to 191,255,207), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 7554 game time, 7554 day time
Known server brands:
Level was modded: false
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
Server brand: fabric
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.class_638.method_8538(class_638.java:611)
at net.minecraft.class_310.method_1587(class_310.java:1921)
at net.minecraft.class_310.method_1514(class_310.java:639)
at net.minecraft.client.main.Main.main(Main.java:204)
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:192)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)

-- System Details --
Details:
Minecraft Version: 1.15.2
Minecraft Version ID: 1.15.2
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: 582528888 bytes (555 MB) / 1308622848 bytes (1248 MB) up to 2147483648 bytes (2048 MB)
CPUs: 8
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:
betterdroppeditems: Better Dropped Items 1.0.1
campanion: Campanion 1.0.9+custom
cloth-config2: Cloth Config v2 2.9.3
fabric: Fabric API 0.5.1+build.294-1.15
fabric-api-base: Fabric API Base 0.1.2+b7f9825d0c
fabric-biomes-v1: Fabric Biomes (v1) 0.1.5+3b05f68e0c
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.4+c6a8ea890c
fabric-commands-v0: Fabric Commands (v0) 0.1.2+b7f9825d0c
fabric-containers-v0: Fabric Containers (v0) 0.1.3+b7f9825d0c
fabric-content-registries-v0: Fabric Content Registries (v0) 0.1.3+b7f9825d0c
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.2+b7f9825d0c
fabric-dimensions-v1: fabric-dimensions-v1 0.3.0+2ad156310c
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.3.0+fac69e320c
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.1.2+b7f9825d0c
fabric-item-groups-v0: Fabric Item Groups (v0) 0.1.6+ec40b2e10c
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.1.1+dfdb52d60c
fabric-loot-tables-v1: Fabric Loot Tables (v1) 0.1.5+e08a73050c
fabric-mining-levels-v0: Fabric Mining Levels (v0) 0.1.1+b7f9825d0c
fabric-models-v0: Fabric Models (v0) 0.1.0+dfdb52d60c
fabric-networking-blockentity-v0: Fabric Networking Block Entity (v0) 0.2.3+e08a73050c
fabric-networking-v0: Fabric Networking (v0) 0.1.7+12515ed90c
fabric-object-builders-v0: Fabric Object Builders (v0) 0.1.3+e4c9a9c30c
fabric-particles-v1: fabric-particles-v1 0.1.1+dfdb52d60c
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.2.6+f3d8141b0c
fabric-renderer-api-v1: Fabric Renderer API (v1) 0.2.10+f08b61330c
fabric-renderer-indigo: Fabric Renderer - Indigo 0.2.23+9290e2ed0c
fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 2.0.1+5a0f9a600c
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.1.3+b7f9825d0c
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.6+12515ed90c
fabric-rendering-v0: Fabric Rendering (v0) 1.1.0+534104900c
fabric-rendering-v1: Fabric Rendering (v1) 0.1.0+534104900c
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.1.10+06c939b30c
fabric-tag-extensions-v0: Fabric Tag Extensions (v0) 0.1.3+abd915800c
fabric-textures-v0: Fabric Textures (v0) 1.0.4+821cdba70c
fabricloader: Fabric Loader 0.8.2+build.194
firstperson: FirstpersonModel 1.0.4
immersive_portals: Immersive Portals 0.25
me_shedaniel_cloth_basic-math: basic-math 0.3.0
minecraft: Minecraft 1.15.2
mm: Manningham Mills 2.0
modmenu: Mod Menu 1.10.1+build.30
optifabric: Optifabric 1.0.0-beta8
org_slf4j_slf4j-api: slf4j-api 1.7.30
org_slf4j_slf4j-simple: slf4j-simple 1.7.30
org_zeroturnaround_zt-zip: zt-zip 1.14
terraform: Terraform 1.4.3+build.29
terrestria: Terrestria 1.2.1+build.29
traverse: Traverse 2.1.11+build.23
Launched Version: fabric-loader-0.8.2+build.194-1.15.2
Backend library: LWJGL version 3.2.2 build 10
Backend API: AMD Radeon RX 580 2048SP GL version 4.6.13587 Compatibility Profile Context 20.4.1 26.20.15029.20013, 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)
Resource Packs: vanilla, optifine
Current Language: English (US)
CPU: 8x AMD Ryzen 5 2400G with Radeon Vega Graphics
OptiFine Version: OptiFine_1.15.2_HD_U_G1_pre13
OptiFine Build: 20200401-232147
Render Distance Chunks: 8
Mipmaps: 0
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: Sildurs Vibrant Shaders v1.27 Extreme.zip
OpenGlVersion: 4.6.13587 Compatibility Profile Context 20.4.1 26.20.15029.20013
OpenGlRenderer: AMD Radeon RX 580 2048SP
OpenGlVendor: ATI Technologies Inc.
CpuCount: 8

Optifine isn't supported