Unable to turn on the attachment button

[Migrated From Jforum.net]

When I try to change the property,Group => Permissions => Attachments, to "Allow All", and then hit the Save button at the bottom, it shows error message at the next page. I have checked with database and table exists with data

An error has occurred.

For detailed error information, please see the HTML source code, and contact the forum Administrator.

Unknown table 'jforum_role_values' in MULTI DELETE

Please help, thanks!
[originally posted on jforum.net by javatech]

[Migrated From Jforum.net]

Which mysql version are you using?

Rafael
[originally posted on jforum.net by Rafael Steil]