SEVERE: CSS files may have not loaded properly. Migrating from Vaadin 7.2 t

Hello, 
I am compiling the theme myself and getting a valid .css file for styles.css. I am using an extension of reindeer that was working perfectly on Vaadin 7.2. I am also using Netbean's sass compiling on save feature and no errors are thrown during the process. During application launch the error:

 com.vaadin.client.ApplicationConnection
SEVERE: CSS files may have not loaded properly.

Is shown on the browser's console output  (widgetsets related) and the page style is not applied at all. 

Any idea about how to solve this issue?

Thanks.

My fault! 
I was placing the results in a wrong place. 

I am sorry for the inconvenience!