Degree overflow in pow_monome - PARI

[Phat Tran <minhphat@gmail.com>]

***   degree overflow in pow_monome.
  ***   Error in the PARI system. End of program.

I got the error message above while running the codes in C using PARI/GP 2.3.5 under cygwin.

>     GEN m = readseq("123456789");
>     GEN n = readseq("1234567");
>     
>     GEN a = readseq("7");
>     GEN c = readseq("8");
>     
>     GEN b = readseq("10358");
>     GEN d = readseq("49850");
>     
>     
>     GEN x = pol_x[fetch_user_var("x")];
>     GEN y = pol_x[fetch_user_var("y")];
>     GEN z = pol_x[fetch_user_var("a")];
>         
>     z = gpowgs(gmodulo(gadd(x, gmodulo(gadd(y, gmodulss(1, n)), gsub(gpowgs(y, c), d))), gsub(gpowgs(x, a), b)), m);

I wonder if the number m is too big for PARI to be handled. 

Thanks,

Minhphat