Add index for mysql table with ndbcluster storage engine

[urgen sherpa]

I am having trouble while adding index on mysql table with ndbcluster storage engine below is the error . [mysqlcluster ver. 7.4 GA]

mysql> alter table `sks_staff_office` add index `pid_index` (pid);
ERROR 1296 (HY000): Got error 156 'Unknown error code' from NDBCLUSTER

mysql> create ONLINE index pid_index on sks_staff_office(pid);
ERROR 1296 (HY000): Got error 156 'Unknown error code' from NDBCLUSTER

mysql> alter online table `sks_staff_office` add index `pid_index` (pid);
ERROR 1296 (HY000): Got error 156 'Unknown error code' from NDBCLUSTER
the link i reffered to is

http://dev.mysql.com/doc/refman/5.6/en/alter-table-online-operations.html