Attempt to index global 'Model' (a nil value),how could I fix this?

I was trying to print the names of the models in my set that I have by using GetUserSets method but I keep getting a error saying: Workspace.Script:8: attempt to index global 'Model' (a nil value) How do I fix it?

InsertService = game:GetService("InsertService")
UserSets = InsertService:GetUserSets(1077607)
Set = UserSets[1] -- Think of this like a tablet Set 1 = 1 Set 2 = 2 and so on
SetId= Set.AssetSetId
Collection = InsertService:GetCollection(SetId)
for i = 1,10 do
Model = Collection[i]
AssestId = Model.AssestId
print(AssestId.Name)
end