*** SOLVED ***
We were running a procedure when we encountered this error:
ORA-25153: Temporary Tablespace is Empty
Once querying dba_temp_files view, there were no temp files being listed. Though the temporary file was residing in the oradata folder and the dba_tablespaces where the tablespace was present.
The Solution:
As it was a temporary tablespace, I could add a tempfile to the same and made the procedure working:
ALTER TABLESPACE temp ADD tempfile '/fullpath.dbf' SIZE 50M;
The error ORA 25153 got solved.
NOTE: Do not give the same name as the existing file in oradata folder. Let the file REST IN PEACE, give a new name. For example if you have temp01.dbf existing create with temp02.dbf.