1. Your DBA check dba_data_files, dba_tablespaces, v$datafile to see how tablespace XXXXX is build up or used.
2. Once you identified the tablespace that has the issue, your DBA should know how to fix the error. For example, by running the statement below:
alter tablespace STLOB add datafile '/u01/app/oracle/ . . . /xxx.dbf' size 10G;