Valuation Overflow

[Ariel Pacetti <apacetti@math.utexas.edu>]

              GP/PARI CALCULATOR Version 2.2.8 (development 
CHANGES-1.1059)
                     i686 running linux (ix86 kernel) 32-bit version
            compiled: Feb 15 2005, gcc-3.2 20020903 (Red Hat Linux 8.0 
3.2-7)
                     (readline v4.3 enabled, extended help available)

                            Copyright (C) 2003 The PARI Group

PARI/GP is free software, covered by the GNU General Public License, and 
comes WITHOUT
ANY WARRANTY WHATSOEVER.

Type ? for help, \q to quit.
Type ?12 for how to get moral (and possibly technical) support.

parisize = 4000000, primelimit = 500000
? 1/(1+q)+O(q^40000)
  ***   valuation (valp) overflow

There is some problem while trying to compute "big" power series. Any 
idea of why this happens, or how to compute this?
Bests,

Ariel