I can write my output on oracle box.

But for now i am trying on client box, and i am getting the below error.

ERROR at line 1:
ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "SYS.UTL_FILE", line 98
ORA-06512: at "SYS.UTL_FILE", line 157
ORA-06512: at "VIMALA.SP_FLATFILE", line 39
ORA-06512: at line 1

How do i overcome this error?

Thanks,
Vimala