I am using: IntelliJ IDEA 11.1.3 (Community edition) and Maven 3.0.4.
The project contains several modules, one of them creates a war-file. When I use \"mvn idea:ide
Just open the project by pointing to the pom.xml file. Skip the maven-idea-plugin, it is obsolete.
The maven-idea-plugin has not been active since 2008.
mvn idea:idea is no longer used. The official page for the plugins usage states Apache Maven IDEA Plugin (RETIRED).
You can directly do File -> Import project and select pom.xml file.

I was getting the same error on Mac (i.e. "Error Loading Project: Cannot load module") too. This is how mine was fixed.
That made it work for me, hope this helps you too :)

mvn idea:idea is obsolete and should not be used, it's known to cause problems. Just open pom.xml directly from IDEA and it will import the Maven project.
To import with more options create a new project from the external Maven model.