Error reading ginv.giv

Dear all,
When I run the following model using -ls6 option, and I had an error
message like below:

lsw ~ mu grup parity !r animal perment giv(animal,1)

PEDIGREE [pedasr.dat ] has 8561 identities, 28206 Non zero elements
  Reading ginv.giv skipping 0 header lines
 After****** lines: something wrong reading ginv.giv
... (cut) ...
Finished: 19 Oct 2006 18:01:18.270 Error reading ginv.giv

I wonder what might be the reason. Is there any limit for the pedigree
size that ASREML can solve regarding the special G matrix?
Many thanks for all attention and response.
Have a great weekend.

--
Agus Susanto
Department of Animal and Poultry Science
Centre for Genetic Improvement of Livestock
University of Guelph, Guelph, Ontario, Canada N1G 2W1
Rm.128, Phone (519) 824-4120 X-58353