Enough space, unlimited tablespace ,why faces the error ORA-01536

Question

the error happened the production database.the case is that enough space, unlimited tablespace for the table owner,but the table index has another owner,the index has a tablespace,the error happened on the index which was in the tablespace. at that time,we were worried,because the error had affected the foregrounding,then we execuated "ALTER USER the table_owner QUOTA <integer> [K/M] ON <tablespacename>;" but now i make a test which reappeared the error,the error has reappeared,but i execuated ALTER USER the table_owner QUOTA <integer> [K/M] ON <tablespacename>; " the error still hanppened. so i don't know if i make a mistak to decide the production database error??? please tell me why ,thank you !

Answer 1

01536, 00000, "space quota exceeded for tablespace '%s'"
// *Cause:  The space quota for the segment owner in the tablespace has
//          been exhausted and the operation attempted the creation of a
//          new segment extent in the tablespace.
// *Action: Either drop unnecessary objects in the tablespace to reclaim
//          space or have a privileged user increase the quota on this
//          tablespace for the segment owner.
ALWAYS
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