Dynamic Dropdowns requires that you create a recordset, if none has been created on the page, you will bet this error.
The purpose of Dynamic Dropdows is to create Parent and child dropdown lists used for drilling down related data from a database.
Take for example a car site. You would have a database containing cars makes and models, using dynamic dropdowns, you could create a parent drop down list that displayed all of the makes from the database. When a make is selected, only the models that relate to that make are displayed in the child list.