internal compiler error: in fold_convert, at fold-const.c:2247

[loc duong ding]

Hi,
I have problem when using gfortran to compile vasp code. The error is:

us.f: In function ‘strdep’:
us.f:505: internal compiler error: in fold_convert, at fold-const.c:2247
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make: *** [us.o] Error 1

I don't know how to solve this problem. I use Gcc4.2.4.
Please give me some suggestions  to solve this error.

Regards,
Loc Duong Dinh
 Duong Dinh Loc