Unable To Create INITIAL Extent For Segment In Tablespace

ORA-01658: unable to create INITIAL extent for segment in tablespace

I am getting above error when a batch job is running.Its insterting data in tables. I checked free space i dont know y its not using avalable space.

Database Version: 11202

select sum(bytes)/1024/1024/1024, sum(maxbytes)/1024/1024/1024 from dba_data_files where tablespace_name='test_data';

sum(bytes) sum(maxbytes)
---------------- -------------
60 0

select sum(bytes/1024/1024/1024) from dba_free_space where tablespace_name='test_data';

sum(bytes/1024/1024/1024)
----------------------
50