If you've received this warning message, it's time to upgrade your account.
If you're unsure why you received this message, notice that what determines your total number of page views (for pricing purposes) is the number of hits to any page that has ethnio code - whether it is on or off. If you turn off a screener after a study and keep the code on your site, that will still count as page views for your account.
You can find this information in Account >> Plan & Usage section of your ethnio account. At the very bottom of the page you'll see something like this: