We are here to help, so tell me did you give all permissions to the database you created for installing amxbans?
What i see from msg it must be the user's permissions for that database. Do you have cpanel so you can create a brand new database? If not , ask your hosting provider to give full permissions to the database you want to use for amxbans.
[Enjoy the life , have fun and be as good as you can in your job's related activities and for sure the path for success is close].