My guess is that it is related to the other inputs you are using Dunnett Quantile(1-alpha, nTrt, dfe, <lambdaVec=.>) (I'm not familiar with this function).
Names Default To Here(1);
Dunnett Quantile(0.95, 3, 11, [1 2 3 4]);
Will throw an matrix dimension error
matrix dimensions are incorrect for operation in access or evaluation of 'Dunnett Quantile' , Bad Argument([1 2 3 4]), Dunnett Quantile/*###*/(0.95, 3, 11, [1 2 3 4])
and this won't
Names Default To Here(1);
Dunnett Quantile(0.95, 4, 11, [1 2 3 4]);
-Jarmo