Could not find method implementation() for arguments [project ':core']

Hello!

My goal is to successfully compile and deploy a libgdx project on the web.

The hardest process for me is to build my project.

I have now decided to start clean, ive downloaded the newest libgdx setup app - 1.9.10
ive completely uninstalled previous version of intellij idea and installed the new 2019.2.4

Now after setup a new clean project my build gradle fails with the following error:

Could not find method implementation() for arguments [project ‘:core’] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

Please help me!
I love understanding and learning new stuff,
I would love to have light shed on this topic and learn how to debug gradle issues more efficiently.

Thanks a lot in advance!