update Virtuemart to 3.0.0

[Peguschwein]

i have updated Virtumemart to 3.0.0
after the update following error is displayed

Incorrect table definition; there can be only one auto column and it must be defined as a key SQL=ALTER TABLE `chd_virtuemart_vmusers` DROP INDEX `i_virtuemart_user_id`

in the backend version 3.0.0 is displayed
How do I fix the error ?

best regards
Pegu