Editor Document API Netbeans 8.1

Hi,

In my netbeans application project, I have a modules that requires Editor Document API, specifically org.netbeans.modules.editor.util/1

In my netbeans platform application, I have added the ide->Editor Document API module.

In my module, I have added Editor Document API as a dependency.

I can compile my project fine, but when I run it, I get the error:

Warning - could not install some modules:
Editor Document API - The module named org.netbeans.modules.editor.util/1 was needed and not found.

In project properties for my module, I am using Sources->Source Level 1.8.

If I look at 'Edit Module Dependency' for Editor Document API, I have a specification version 1.5.1.1. Could this cause a conflict?

Any help much appreciated.