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Quoting the documentation:
"Previous versions of the data binding compiler generated the binding classes in the same step that compiles your managed code. If your managed code fails to compile, you might get multiple errors reporting that the binding classes aren't found. The new data binding compiler prevents these errors by generating the binding classes before the managed compiler builds your app.

To enable the new data binding compiler, add the following option to your gradle.properties file:

android.databinding.enableV2=true

You can also enable the new compiler in your gradle command by adding the following parameter:

-Pandroid.databinding.enableV2=true
"
url - import com.example.kaustubh.roomsapp.databinding.ActivityMainBinding;

The commands mentioned do not help , still getting multiple errors like "error: cannot find symbol class DataBindingComponent".
The binding classes were generated in 3.2.1 but are  non-compatible with 3.2.1.