[Axiom-developer] i can't understand this error

[matteo serventi]

Hi,
may you help me with this error?

I give these commands

Q:=FRAC INT;
vl:=[t1,t2,t3,t4,t5,t6,t7,t8,t9,t10];
RG:= DMP(vl,Q);
FRG:=FRAC(RG)
IRG:=IDEAL(Q,DirectProduct(#vl,NNI),OrderedVariableList vl, RG)

and i get this error

>> System error:
    Lisps arglist maximum surpassed

These commands work if the length of vl is at most 8 but i don't know 
why and where the problem is.

Thank you
Matteo