Error in 1.01-Exercise-RunYourFirstTask Could not find GradleWrapperMain

I'm running **1.01-Exercise-RunYourFirstTask** from Ubuntu 18.04.

But it's giving me the following error:
**Error: Could not find or load main class org.gradle.wrapper.GradleWrapperMain**

Java version:
**java version "1.8.0_191"**
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)