Supertypes of the following classes cannot be resolved

[scarings]

Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:
class com.opensooq.pluto.base.PlutoAdapter, unresolved supertypes: android.support.v7.widget.RecyclerView.Adapter

class com.opensooq.pluto.base.PlutoViewHolder, unresolved supertypes: android.support.v7.widget.RecyclerView.ViewHolder

build.gradle

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 28
    defaultConfig {
        minSdkVersion 17
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'

    implementation 'com.opensooq.android:pluto:1.4'

    implementation 'com.github.bumptech.glide:glide:4.9.0'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

What is wrong?

[scarings]

ah, sorry i forgot to add this line

implementation 'com.android.support:recyclerview-v7:28.0.0'