Can't understand Expression 'shadowJar'

[TSERATO]

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Shadow Version

8.1.1

Gradle Version

Latest

Expected Behavior

Compile/Build

Actual Behavior

"Expression 'shadowJar' cannot be invoked as a function. The function 'invoke()' is not found"

Gradle Build Script(s)

plugins {
    id("com.github.johnrengelman.shadow") version "8.1.1"
    id("java")
}

group = "dev.sandwich.vredirect"
version = "1.0.0"

repositories {
    mavenCentral()
    maven("https://repo.papermc.io/repository/maven-public/")
}

dependencies {
    compileOnly("com.velocitypowered:velocity-api:3.3.0-SNAPSHOT")
    annotationProcessor("com.velocitypowered:velocity-api:3.3.0-SNAPSHOT")
    implementation("dev.dejvokep:boosted-yaml:1.3.4")
}

shadowJar {
    relocate("dev.dejvokep.boostedyaml", "dev.sandwich.vredirect")
}

java.toolchain.languageVersion.set(JavaLanguageVersion.of(17))

Content of Shadow JAR (jar tf <jar file> - post link to GIST if too long)

Can't export JAR.

[rafi67000]

tasks {
    shadowJar {}
}

or

tasks.shadowJar {}