ORA-26028: index initially in unusable state

I am trying to understand why I get this error when using direct path sqlldr.

There are no constraints on the table, just this index which is one field in the table.

Why do I get this error?.

The error text says

Either rebuild the index, re-create the index, or use either

       SKIP_UNUSABLE_INDEXES or SKIP_INDEX_MAINTENANCE (Sql*Loader only).

but it is not clear to me which I should do. using the skip options seems easiest, but what are the implications of using any of the skip options?

Any help appreciated

John

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