Question: Error on explore Command

restart, with(plots);
startingTime := 1800;
interval := 10;
P(0) := 5.308;
P(t) = 5.308*M/(5.308 + (M - 5.308)*exp(-kMt));
                                5.308 M           
              P(t) = -----------------------------
                     5.308 + (M - 5.308) exp(-kMt)


diff(P(t), t) = kP(t)*(M - P(t));
                   d                         
                  --- P(t) = kP(t) (M - P(t))
                   dt                        

Explore(plot([P(t), [[0, 5.308], () .. (), [140, 131.7]]], t = 0 .. 0.140, P = 0 .. 140, style = [line, point], gridlines = true), parameters = [[M = M_0 .. M_1], [k = k_0 .. k_1]]);
Error, (in Explore) incorrect first argument [P(t), [[0, 5.308], () .. (), [140, 131.7]]]

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