The image is generated as a pop-up window. If you can't see the image it's likely that your browser has blocked the pop-up window. For the generation to work make sure that your browser allows Vertabelo to open pop-up windows.
It's also likely that the you use an ad-blocking extensions that breaks Vertabelo, read more here.
Сервис поддержки клиентов работает на платформе UserEcho