UTL_FILE question

[Jana W]

Is there a limit to the number of files that can be written to using UTL_FILE.PUT_LINE in a session?

I need to write to 58 total files from several cursors so I'm closing them all at the end of the procedure with UTL_FILE.FCLOSE_ALL. I'm getting an ORA-29283: "invalid file operation" when attempting to write to the 52nd file.

Thanks for any help,
Jana