Followed exact steps shown in the video, but getting "FAILURE: Build failed with an exception." when run bootRun

error message:

3:19:43 PM: Executing task 'bootRun'...

Gradle Daemon started in 6 s 287 ms

Task :compileJava UP-TO-DATE Task :processResources NO-SOURCE Task :classes UP-TO-DATE Task :findMainClass FAILED

FAILURE: Build failed with an exception.

What went wrong: Execution failed for task ':findMainClass'. > org.gradle.api.tasks.SourceSetOutput.getClassesDir()Ljava/io/File;

Code: package com.teamtreehouse;

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

@EnableAutoConfiguration public class AppConfig { public static void main (String[] args) { SpringApplication.run(AppConfig.class, args); } }