ORA-01652 on oracle managed temp tablespace

I got ORA-01652: unable to extend temp segment by 256 in tablespace TEMPTS1 while creating a table on a 9.2.0.4 database with oracle managed temp tablespace. There is no datafile from dba_data_files or v$dbfile so I am not sure what is the correct way to add more space to this temp tablespace. Could someone let me know the proper way to do it here?

Thanks.

dba_temp_files, temporary tablespace files are not listed in dba_data_files

so either a datafile or resize it using

alter database TEMPFILE ...