ORA-01654: unable to extend index - on Oracle9i

Running Oracle9i

Today, we started receiving the following errors in a production Oracle database:

ESQL ERR vSqlError(). RC=-1654 - ORA-01654: unable to extend index ISOFT.NOTICE_TONAME_INDEX by 128 in tablespace ISOFT_TABLES      

ESQL ERR vSqlError(). RC=-1654 - ORA-01654: unable to extend index ISOFT.NOTICE_FROMNAME_INDEX by 128 in tablespace ISOFT_TABLES  

Based on an Oracle kb article, I obtained the following:

TABLESPACE NAME                CONTIGUOUS BYTES
------------------------------ ----------------
ISOFT_TABLES                      2,097,086,464

TABLESPACE_NAME                # OF EXTENTS     TOTAL BYTES
------------------------------ ------------ ---------------
CWMLITE                                   2      11,141,120
DRSYS                                     1      10,813,440
EXAMPLE                                   1         131,072
INDX                                      1      26,148,864
ISOFT_INDEXES                             1      10,420,224
ISOFT_TABLES                              1   2,097,086,464
ODM                                       1      11,206,656
SYSTEM                                   13      88,670,208
TOOLS                                     1      10,420,224
UNDOTBS1                                 14     187,367,424
USERS                                     1      26,148,864
XDB                                       1         196,608



SQL> select file_name, bytes, autoextensible, maxbytes from dba_data_files where tablespace_name='ISOFT_TABLES';

FILE_NAME             BYTES             AUT         MAXBYTES
isoft_tables01.dbf      2097152000       YES       2097152000

I am not an Oracle DBA and I am not sure how to overcome these errors.  Based on what I have read, here are two options:

1.  Run the tollowing command ALTER DATABASE DATAFILE 'isoft_tables01.dbf' AUTOEXTEND ON MAXSIZE UNLIMITED;

2.  Get rid of fragmentation is drop and recreate the object. I am not sure how to export and import the table.  If this is the best approach, I would appreciate someone leading me through it.

Can someone lead me in the right direction?

Thanks for any help,
Shannon