I have the same issue when I run 'app' after adding some new dependencies. I solved my issue by checking and removing the duplicates dependencies in build.gradle(:app), invalidate caches File->Invalidate Chaces, and update dependencies variable.

Update dependencies variable on Android Studio:

1. Click 'Build' on Toolbar.
2. Click 'Edit library and dependencies'.
3. Click 'Suggestions'.
4. Choose 'app' on Modules tab.
5. See if any warnings showed up on the right side, click 'Update Variables' on the dependencies/library.
6. Then click 'Apply'.

I hope it works for you guys as well.