'oracle how to alter table add partition by range interval

i have searched a lot but i have found nothing about how to add a range partition to an existing table

alter table myuser.mytable
add PARTITION  BY RANGE (mynumber) INTERVAL (1)
( PARTITION p1 VALUES LESS THAN (108))

that gives me ORA:14150 error, SUBPARTITON keyword is missing, but i dont want to give subpartition

oracle oracle11g

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