Building workspace error while creating groovy class in Eclipse - eclipse

I am new to Groovy or any programming language and new to Eclipse as well.
I am following a tutorial on youtube which shows us how to install Eclipse Oxygen and then add plugin of Groovy.
I followed everything and created Groovy project but while creating the class it gives me below error(Screenshot attached).
Could you please guide on how can I fix this? Thanks in advance.
Eclipse Details :
Eclipse Java EE IDE for Web Developers.
Version: Oxygen.3a Release (4.7.3a)
Java Version : 1.8.0_231
Groovy version : 3.0.3 JVM 1.8.0_231
My OS : Windows 10
Error Screen Shot

I strongly suggest you try a newer version of Eclipse, it shouldn't impact a tutorial's steps.

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