area contents overflows area in line

Hi

I'm trying to convert PDF from fo.
Everytime I try, I get following error.

[INFO] No spaces to justify text in line (8)
[INFO] [5]
[INFO] area contents overflows area in line
[INFO] area contents overflows area in line
[INFO] area contents overflows area in line
[INFO] area contents overflows area in line
[INFO] area contents overflows area in line
[ERROR] -2


If someone had the same one,
I wish them to let me know what's going on.

Regards,
--Hisashi.Yamaguchi

OS : Windows XP SP2
Apache FOP : 0.20.5
J2SE : 1.4.2_07