grails - Asset-Pipeline does not show Background Images in Production? -

I use Grails property-pipeline and tried to use the following in my CSS:

< Pre> Background: URL ('Landing / Background 1.jpg') 0 No-repeat;

It works fine in Dev mode but nothing in production is being set.

Edit:
Image Path grails-app / assets / images / landing / background1.jpg

How can I get Is the background image working with the property-pipeline correctly in the production mode?