Chart not showing on variable Product

Hi, Ich habe das Free Plugin und benutze variable Produkte.
auf der Produkt ebene zeigt das Plugin “No pricing data recorded since plugin activation – This message indicates that no pricing data has been saved in the database since the activation of the plugin. This can occur if the plugin was recently installed or if the product price has not changed since the activation of the plugin.”

However, the price changes are displayed on the variant.

However, no chart is displayed. why?
Thank you for your help.

The page I need help with: [log in to see the link]