Resource interpreted as Image but transferred with MIME type text/html

I am experiencing the aforementioned issue when I run my java web app in my development environment. Here are my environment details:

OS: Mint Linux App Server: Apache Tomcat 7 Framework: VAADIN 6.8.4 IDE: Eclipse Juno.

The images that come with VAADIN are displayed correctly but for any other images I get the error: “Resource interpreted as Image but transferred with MIME type text/html”

the image i am trying to load is a png image and there is no corruption as it can be displayed in the same browser using the “open with” command from the file manager.

please help