Unable to get Recylerview By Id

Support
1

I am currently trying to get Recycler view but it always becomes null. Did I miss anything appium 1.9.1. Glag if anyone can help.

    @AndroidFindBy(id = "pieCategories")
@WithTimeout(time = 15, unit = TimeUnit.SECONDS)
@CacheLookup
private List<MobileElement> pieCategories;