ORA-01654: unable to extend index when we have more than 300Gb of free space

Hello, We are facing a strange problem on our database. When the application try to do an insert on some tables (TABLE1 for example), it's encounter ORA-01654 however more than 300Gb is available. The tablespace concerned is DATA , it's defined like :          CREATE SMALLFILE TABLESPACE "DATA" DATAFILE NOLOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO       The tablespace contain  28 datafiles  like : '+DATA/Mydb/datafile/data.295.798113921' SIZE 32000M REUSE AUTOEXTEND ON NEXT 1024K MAXSIZE 32000M  Error message     SQL>   insert into * ERROR at line 1: ORA-01403: no data found ORA-06512: at " TABLE1", line 233 ORA-06512: at "TABLE1", line 159 ORA-01654: unable to extend index  TABLE1_PK by 128 in tablespace