Scala shadow jar not able to find Main class - scala

Question

Does anyone know what is the problem. It is something with the scala version. I am trying to create a shadow jar using gradle and scala. I am continuously getting this error. My main class is exactly at this location com.pro.TempMain. I have tried different version nothing seems to work. However if I put a java class it totally works.
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: scala/Function0
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: scala.Function0
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
This is my gradle file configuation:
buildscript {
repositories {
mavenCentral()
maven {
url "https://plugins.gradle.org/m2/"
}
}
dependencies {
classpath "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.0.1"
}
}
plugins {
id 'java'
id 'com.github.johnrengelman.shadow' version '1.2.3'
id 'com.github.maiflai.scalatest' version '0.12'
}
group 'com.pro'
version '1.0-SNAPSHOT'
apply plugin: 'java'
apply plugin: 'scala'
apply plugin: 'com.github.johnrengelman.shadow'
apply plugin: 'idea'
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
mavenCentral()
}
jar {
manifest {
attributes 'Main-Class': 'com.pro.TempMain'
}
}
sourceSets {
main {
scala {
srcDirs = ['src/main/scala']
}
}
test {
scala {
srcDirs = ['src/test/scala']
}
}
}
shadowJar {
zip64 true
}
dependencies {
compile 'org.scala-lang:scala-library:2.12.0'
}