When you click on the little 2 to the left of the message, what does the expanded error show? Does it give you a fix-it?

Also, what happens if you change this:

private var allBases: [Locations] = Locations.allBases
var filteredLocations: [Locations] {
    if searchText.isEmpty() {
        return allBases
    } else {
        return allBases.filter { $0.name.localizedCaseInsensitiveContains(searchText) }
    }
}

to this:

var filteredLocations: [Locations] {
    if searchText.isEmpty {
        return Locations.allBases
    } else {
        return Locations.allBases.filter { $0.name.localizedCaseInsensitiveContains(searchText) }
    }
}