Thymeleaf IDE support

I see that newer versions of Intellij have very nice thymeleaf support (see: https://blog.jetbrains.com/idea/2014/09/intellij-idea-14-ships-advanced-coding-assistance-for-thymeleaf/)

However i cant get this to work on XP projects. Is there any way to make this work?

This works when we test it. Just define the namespace on the first tag.