incorect table definition

[MKI-Miro]

should i care about this messae or it is ok ?

alterTable DROP z3mkc_virtuemart_ratings.i_virtuemart_product_id :Incorrect table definition; there can be only one auto column and it must be defined as a key SQL=ALTER TABLE `z3mkc_virtuemart_ratings` DROP INDEX `i_virtuemart_product_id`
alterTable DROP z3mkc_virtuemart_ratings.i_virtuemart_product_id :Incorrect table definition; there can be only one auto column and it must be defined as a key SQL=ALTER TABLE `z3mkc_virtuemart_ratings` DROP INDEX `i_virtuemart_product_id`

thanks