Error in step 3 when installing photopost classifieds

[lygren]

At the last the, I get the following error:

MySQL error reported!

Script: install

Query: SELECT group_id,group_name FROM groups WHERE group_type=2 OR group_single_user=0

Result: Table 'avforum.groups' doesn't exist

Database handle: Resource id #5

[Chuck S]

You have not entered the proper forum table prefix it looks like.