Download png image in

Hi, I have a simple question : I would download a png image with my application on but in the log file I have the following message : File www/iris.png not found in resource path, whereas the file and the folder are correct. My code is the following :

Sidebar-Density {.sidebar data-weight=300}
**Introduction:** The Iris flower data set or Fisher's Iris data set is a 
multivariate data set introduced by the British statistician and biologist 
Ronald Fisher in his 1936 paper 
(Source : [wikipedia](

![](www/iris.png){#id .class width=100% height=70%}

Could you help me ? Thanks in advanced