Hanif - I think you have a previous package. Download the latest and overwrtie your files (I stumbled across that error shortly after I upoaded the first RC1 and am pretty sure I fixed it then).
Reeve - That totally depends on how you have it configured.
Text ads (i.e. adsense)=0 queries
1 static banner on a page with no tracking =1 query
More than 1 image/flash banner on a page with no tracking=2 queries
If any of the banners on the page require impression tracking then there is a minimum of an additional query per page. This is per banner that requires the impression tracking however there is a throttle level that dictates the maximum number of queries are made from impressions. For example, if you have 3 banners on a page that you are requiring impression tracking on and your throttle is set to a number less than 3, then it rolls up those queries into 1 to be unpacked at a later stage by the cron job.
Kind of complex, but all in the name of customization