Mambo User section won't open

I have been using aMember with Mambo for several years with no problem. I know that aMember has priority over the Mambo user database. But now I need to enter a new Mambo administrator, but when in Mambo administration I click on Users I get a database error message:

DB function failed with error number 1034
Incorrect key file for table 'waha_core_acl_aro'; try to repair it SQL=SELECT a.*, g.name AS groupname, s.userid AS loggedin FROM waha_users AS a INNER JOIN waha_core_acl_aro AS aro ON aro.value = a.id INNER JOIN waha_core_acl_groups_aro_map AS gm ON gm.aro_id = aro.aro_id INNER JOIN waha_core_acl_aro_groups AS g ON g.group_id = gm.group_id LEFT JOIN waha_session AS s ON s.userid = a.id GROUP BY a.id LIMIT 0, 50

Is this standard with aMember installed or is it a real error? And how can I create a new Mambo administrator? I created a super administrator in aMember but that id doesn't work in Mambo at all; only ids in the membership section of aMember listed as current work.

Just to know if I need to try to fix the Mambo database would be helpful.

--Leslie Evans, webmaster, West Adams Heritage Association (Los Angeles)