IntelliJ "Cannot resolve symbol 'CottonClientScreen'" for fabricMC minecraft modding - gradle

Question

I have been trying to re-familiarize myself in Java and decided to tackle making a Minecraft mod as it seemed fairly simple. I set up IntelliJ IDEA for Manjaro linux and set up my build.gradle. Everything seemed to be working smoothly until I tried to add the dependency "CottonMC:LibGui" which is a dependency for making intuitive GUI's for Minecraft mods. When I added the dependency to my project, I recieved the error, "Cannot resolve symbol 'CottonClientScreen'" which is a part of the LibGui dependency. I feel as if this is likely a beginner mistake, but I have not been able to find a solution on the internet.
What I've tried:
Running ./gradlew genSources after adding the dependency to my repositories and dependencies sections of my build.gradle
Restarting IntelliJ and clearing my cache
Searching for the dependency in IntelliJ using the "Generate Dependency" tool (the dependency did not come up even when I copied the exact link to it)
Files in Question:
build.gradle (trimmed to only contain relevent sections)
repositories {
maven {
name = "CottonMC"
url = "https://server.bbkr.space/artifactory/libs-release"
}
}
dependencies {
minecraft "com.mojang:minecraft:${project.minecraft_version}"
mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
modImplementation include("io.github.cottonmc:LibGui:6.3.0+1.19")
}
Implementation file:
import io.github.cottonmc.cotton.gui.GuiDescription;
import io.github.cottonmc.cotton.gui.client.CottonClientScreen;
public class screen extends CottonClientScreen {
}
Exact error:
Java Version
openjdk version "18.0.2" 2022-07-19
OpenJDK Runtime Environment (build 18.0.2+0)
OpenJDK 64-Bit Server VM (build 18.0.2+0, mixed mode)
Thank you for your help!