Internal software error in the tostring function for files greater than 300 MB

Hello,

When I run my awk script with input files greater than 300 MB I always get this error:

awk: Internal software error in the tostring function on TS1101?05044400?.0085498227?0?.0011041461?.0034752266?.00397045?0?0?0?0?0?0?11/02/10?09/23/10???10?no??0??no?sct_det3_10_20110516_143936.txt

Could anybody please help me with this problem?