Problemas con mainTemplate.gradle

Unity 6000.0.36f1 me pone esto:

We’ve detected that your custom Assets/Plugins/Android\mainTemplate.gradle file is using deprecated attributes such as packagingOptions. We can fix this automatically, your current mainTemplate.gradle file will be backed up. Continue?

Cuando dejo que unity solucione automaticamente empiezo a tener muchos problemas. Que puedo hacer?