dialyzer error ?

amoc_dist.erl

-spec do(amoc:scenario(), non_neg_integer(), non_neg_integer(), amoc:do_opts()) -> [any()].
do(Scenario, Start, End, Opts) ->
    Nodes = proplists:get_value(nodes, Opts, nodes()),

    _InterArrival = proplists:get_value(interarrival, Opts, 75),
    _RepeatTimeout = proplists:get_value(repeat, Opts, 75),
    _Step = proplists:get_value(step, Opts, 1),

    amoc_event:notify({dist_do, Scenario, Start, End, Opts}),
    Count = length(Nodes),
    [ amoc_controller:do(Node, Scenario, Start, End, Count, Id, Opts) ||
      {Id, Node} <- lists:zip(lists:seq(1, Count), Nodes) ].
      
%% From amoc controller
-spec do(node(), amoc:scenario(), non_neg_integer(), non_neg_integer(), [node()],
         non_neg_integer(), amoc:do_opts()) -> ok | {error, term()}.
do(Node, Scenario, Start, End, Nodes, NodeId, Opts) ->
    gen_server:call({?SERVER, Node}, {do, Scenario, Start, End, Nodes, NodeId, Opts}).