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Question: Error, (in gfun:-rectodiffeq) invalid input

Question:Error, (in gfun:-rectodiffeq) invalid input

Ex 95 Maple
differential-equation
September 25 2011
0

erec :=  mu Q(n + 1) - (n + mu) Q(n) + n Q(n - 1);
with(gfun);
opoly := rectodiffeq(erec, Q(n), f(z));


Error, (in gfun:-rectodiffeq) invalid input: getname expects its 1st argument, yofz, to be of type function(name), but received (z(z)*mu(z)*_C[0](z)-mu(z)*_C[1](z)*z(z)-mu(z)*_C[0](z))/(z(z)*mu(z)-mu(z))
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