Unable to find module with Gradle path. Linking to library -unspecified instead

I faced this with Android Studio 2.2.3. The problem was with the .iml file that was causing the problem.

After importing the module folder into the project directory and adding the changes to include module in settings.gradle, delete the .iml file from the module folder and do a Gradle Sync. Then right click on any module in the Project Window and click on "Configure Project Subset...", if the imported module is not checked, check it and Android Studio should do a Gradle Sync. By then the imported module will appear in the Project Window and will have a .iml file regenerated that is does not cause any issues.

1. delete the .iml file under the error module.
2. restart Android studio