Wicked pdf image problem

Hello Everyone,

I am using Wicked Pdf to generate pdf file.

In my model, i have method to generate pdf file.

I also need to show image in my pdf file from amazon s3.

Case 1:
i tried using
While i am running that method image not displaying, just a small box
only appearing insteat of image
.
Case 2:
i tried <%= image_tag(@image.avatar)%>
While i run this, i am getting “rake aborted!
undefined method `image_tag’ for main:Object

i googled this problem but no clear answer… any help…