issues in using library "com.github.mancj:SlideUp-Android:$current_version"

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ifile:- build-gradle(project:reaction)
buildscript {

repositories {
google()
jcenter()
mavenCentral()
maven { url 'https://jitpack.io' }

}
dependencies {
classpath 'com.android.tools.build:gradle:3.1.4'

// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}

allprojects {
repositories {
google()
jcenter()
mavenCentral()
}
}

task clean(type: Delete) {
delete rootProject.buildDir
}

file:- build-gradle ( module:app)

apply plugin: 'com.android.application'

android {
compileSdkVersion 28
defaultConfig {
applicationId "com.technetty.reaction"
minSdkVersion 15
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
implementation 'com.android.support:design:28.0.0-rc01'
implementation 'com.android.support:support-v4:28.0.0-rc02'
testImplementation 'junit:junit:4.12'
implementation 'pl.droidsonroids.gif:android-gif-drawable:1.2.+'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.facebook.android:facebook-login:[4,5)'

<---- this line have error in "$current_version" i tryed $current_version= v2.2.8---->
// implementation "com.github.mancj:SlideUp-Android:$current_version"
}

Start with the root build.gradle and app module build.gradle shown in the issue, especially the commented SlideUp-Android dependency line. Reproduce the reported build error with the listed Android and dependency versions, then confirm the correct dependency declaration and a successful build.

Written by the indexing model from the issue text.