I have included the right dependencies as in implementation 'org.jetbrains.kotlin:kotlin-compiler-embeddable:1.6.21', and tried invalidating caches and re-opening the project. However, it still triggers the errors Unresolved reference: KotlinLexer and Unresolved reference: KotlinParser.

Here’s the code segment that imports the KotlinLexer and KotlinParser:

...
import org.jetbrains.kotlin.spec.grammar.tools.*
import org.jetbrains.kotlin.spec.grammar.KotlinLexer
import org.jetbrains.kotlin.spec.grammar.KotlinParser
...

Here’s my build.gradle for your reference:

plugins {
    id 'org.jetbrains.kotlin.jvm' version '1.6.10'
    id 'org.jetbrains.intellij' version '1.2.1'
    id 'java'
    id 'antlr'
}

group 'me.ylee'
version '1.0-SNAPSHOT'

repositories {
    google()
    mavenLocal()
    mavenCentral()
    maven {
        url "https://plugins.gradle.org/m2/"
    }
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.6.0"
    implementation 'org.jetbrains.kotlin:kotlin-compiler-embeddable:1.6.21'
    implementation "net.java.dev.jna:jna:5.11.0"
    antlr 'org.antlr:antlr4:4.10.1'
    implementation 'org.antlr:antlr4-runtime:4.10.1'
    // Dependency on local binaries
    implementation fileTree(dir: 'libs', include: ['*.jar'])
}

intellij {
    plugins = ['Kotlin', 'java']
}

compileKotlin {
    kotlinOptions.jvmTarget="1.8"
}

compileTestKotlin {
    kotlinOptions.jvmTarget="1.8"
}

Does anyone know how to resolve these unresolved reference errors?