[Plugin: Easyfileshop] Tax on items though PayPal – invalid price error

Hi, I am trying to add local state tax through Paypal and am having issues with it counteracting the price of my items. Once the item is purchased it gives me an “invalid price” error and no download link email is sent out. My only solution now is to turn off the tax on paypal to make the download email appear, otherwise all you get is a payment sent email.

Is there any solution?

Thanks

http://wordpress.org/extend/plugins/easyfileshop/