this is the crash report
---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 3/18/20 11:32 AM
Description: Exception in server tick loop

java.lang.IllegalStateException: Mixin is NOT loaded. Install MixinBootstrap. https://www.curseforge.com/minecraft/mc-mods/immersive-portals-for-forge
at com.qouteall.immersive_portals.ModMain.checkMixinState(ModMain.java:69) ~[?:0.15] {re:classloading}
at com.qouteall.immersive_portals.ModMainForge.onServerTick(ModMainForge.java:94) ~[?:0.15] {re:classloading}
at net.minecraftforge.eventbus.ASMEventHandler_1_ModMainForge_onServerTick_ServerTickEvent.invoke(.dynamic) ~[?:?] {}
at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-1.0.0-service.jar:?] {}
at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-1.0.0-service.jar:?] {}
at net.minecraftforge.fml.hooks.BasicEventHooks.onPreServerTick(BasicEventHooks.java:114) ~[?:?] {re:classloading}
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:762) ~[?:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:161) ~[?:?] {re:classloading,xf:OptiFine:default}
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:622) [?:?] {re:classloading,pl:accesstransformer:B}
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_74] {}

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: Mac OS X (x86_64) version 10.15.3
Java Version: 1.8.0_74, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1392057592 bytes (1327 MB) / 2147483648 bytes (2048 MB) up to 2147483648 bytes (2048 MB)
CPUs: 4
JVM Flags: 8 total; -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-1.14.4-28.2.0.jar object_holder_definalize PLUGINSERVICE
/forge-1.14.4-28.2.0.jar runtime_enum_extender PLUGINSERVICE
/accesstransformers-1.0.1-milestone.0.1+94458e7-shadowed.jar accesstransformer PLUGINSERVICE
/forge-1.14.4-28.2.0.jar capability_inject_definalize PLUGINSERVICE
/forge-1.14.4-28.2.0.jar runtimedistcleaner PLUGINSERVICE
/OptiFine_1.14.4_HD_U_F5.jar OptiFine TRANSFORMATIONSERVICE
/forge-1.14.4-28.2.0.jar fml TRANSFORMATIONSERVICE
FML: 28.2
Forge: net.minecraftforge:28.2.0
FML Language Providers:
[email protected]
minecraft@1
Mod List:
forge-1.14.4-28.2.0-client.jar Minecraft {[email protected] DONE}
immersive-portals-0.15(for+mc+1.14+with+forge).jar Immersive Portals {[email protected] DONE}
forge-1.14.4-28.2.0-universal.jar Forge {[email protected] DONE}
MinecraftCapes Forge 1.14.4.jar James090500's MinecraftCapes Mod {[email protected] DONE}
Player Count: 0 / 8; []
Data Packs: vanilla, mod:forge, mod:immersive_portals, mod:minecraftcapes
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'forge'
OptiFine Version: OptiFine_1.14.4_HD_U_F5
OptiFine Build: 20191204-141250
Render Distance Chunks: 8
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 2.1 NVIDIA-14.0.31 355.11.11.10.10.143
OpenGlRenderer: NVIDIA GeForce GT 755M OpenGL Engine
OpenGlVendor: NVIDIA Corporation
CpuCount: 4

1. Wrong mod
2. Try reading the error message