Cannot find Library.Extension

[srossi3]

Hi all, I am trying to import a Unity project in my react native application. I tried following the general instructions and it resulted in an error. Now i cloned this example file, followed the intructions and the same error appears. It is this one:

Could not find method bundle() for arguments [build_99q93k10d6vp7m7tejceyj4qi$_run_closure3$_closure12@6612fee7] on object of type com.android.build.gradle.LibraryExtension.

Any idea how I can solve this? in both cases i followed step by step the instructions that were given and in both cases this is the error i have

Thank you, silvia