Importing Starter Samples in a new project doesn't work

Good Afternoon.

I'm trying to import starter samples to a project but this error appears in a few files :

'OVRLocatable' does not contain a definition for 'SetEnabledSafeAsync' and no accessible extension method 'SetEnabledSafeAsync' accepting a first argument of type 'OVRLocatable' could be found (are you missing a using directive or an assembly reference?)

Does someone encounter the same issue ?