manage partition wizard is not highlighted

I have done partition for BBC Table on "modified_on" column having datetime data type.

All partitioning steps i have done using query not GUI. process completed without any error. But when i go to Manage parition wizard then I received below message.

"You will not be able to switch out or switch in data in this table since the table has non storage aligned indexes on it."

What is the meaning of this error, I don't understand the "non storage aligned index ".

Is this mean my partition will not work or is there something wrong ? if its wrong then how to resolve this?

Please help

I used below steps.

1.CREATE PARTITION FUNCTION

2.create partition scheme

3. drop cluster index & then create cluster index as below.

ALTER TABLE [dbo].[BBC] ADD  CONSTRAINT [BBC_PK_EventId] PRIMARY KEY CLUSTERED
([Event_Id] ASC)
WITH (PAD_INDEX  = ON, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF,ONLINE = OFF,
ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON, FILLFACTOR = 100) ON EventScheme (Event_id)