Should be:
<cfquery name="Specify_The_Name_of_This_Query>
SELECT size, amount, id
FROM productsize
WHERE productid=#Session.ProductId#
ORDER BY id ASC
</cfquery>
In here F:\hshome\bikinifernanda\bikinifernanda.com\dsp_Slider.cfm, what is the name of the query. See line 5. Something like query="Query_Name"