Parse push notification on Unity

Hi, i'm trying to use the parse SDK for unity.

I'm following their tutorials. I tried with blank project and also with an existing one. I added all recquired stuff. (from https://www.parse.com/apps/quickstart?app_id=parseunitypushsample#parse_push/unity/android/existing or https://www.parse.com/apps/quickstart?app_id=parseunitypushsample#parse_push/unity/android/new)

In both cases, it's the same. When i click on "Test" on parse website, it just shows : "Can't find any registered devices yet..."

I don't even understand the differences between adding to an new project or to an existing project. In the first part you have to "attach the Parse Initialize Behaviour and PushBehaviour script components to it." whereas in the second part you just have to "attach the Parse Initialize Behaviour script component to it:"

I can also say that it instantly crashes on android phone. (with empty scene and the initialiser gamobject) It seems that questions about parse on unity aren't existing.

Any idea ?

Thanks !