Cannot resolve language with id ''JVM'' and "Kotlin"

Hello, 

I was trying to create a plugin that adds line markers to both Java and Kotlin PSI elements. I followed the documentation and tried to solve the problem. Still can't figure out why this problem is happening. I am a student and a beginner for this problem. Please help for understanding why this problem occurs and how to solve it.

Unresolved code is marked below <<not solved>>

My plugin.xml is:

<idea-plugin>
    <id>example.de.LineMarker</id>
    <name>Line Marker for Trial</name>
    <vendor email="support@example.de" url="http://www.example.de">Example Company</vendor>
    <description><![CDATA[
   line marker to trial part..........<br>
    ]]></description>
    <!-- please see https://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
         on how to target different products-->
    <depends>com.intellij.modules.platform</depends>
    <depends>org.jetbrains.android</depends> <<not solved>>
    <depends>org.jetbrains.kotlin</depends>
    <extensions defaultExtensionNs="com.intellij">
        <codeInsight.lineMarkerProvider language="JVM" <<not solved>>
                                            implementationClass="de.example.LineMarker.RandomLineMarker"/>
        <codeInsight.lineMarkerProvider language="Kotlin" <<not solved>>
                                        implementationClass="de.example.LineMarker.RandomLineMarker"/>
    </extensions>        
    <actions>
        <!-- Add your actions here -->
        <action id="ExecuteLineAnalysis"
                class="de.example.LineMarker.RunLineMarkerAction"
                text="Run Line Marker" description="Check for Line Marker">
            <add-to-group group-id="AnalyzeMenu" anchor="last"/> <<not solved>>
        </action>
    </actions>
</idea-plugin>

My build.gradle is following: 

plugins {
    id 'java'
    id 'org.jetbrains.intellij' version '0.4.21'
    id 'maven'
    id 'org.jetbrains.kotlin.jvm' version '1.3.72'
}
apply plugin: 'idea'
apply plugin: 'org.jetbrains.intellij'
apply plugin: 'java'
apply plugin: "kotlin"

group 'de.example'
version '1.0-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
    mavenLocal()
    mavenCentral()
}
dependencies {
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.72")
    testCompile group: 'junit', name: 'junit', version: '4.12'
    compile group: 'org.swinglabs.swingx', name: 'swingx-all', version: '1.6.4'
    compile "org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.72"
}
intellij {
    plugins 'android', 'java', 'maven', 'gradle'
    plugins 'Kotlin'
    //version '2019.2.2'
    updateSinceUntilBuild false
}
runIde {
    jvmArgs '-Xmx4G'
    jvmArgs '-Xss100m'
}
patchPluginXml {
    sinceBuild '191'
    untilBuild '202.*'
    changeNotes """
      Add change notes here.<br>
      <em>most HTML tags may be used</em>"""
}