Classpath entry invalid error message

When I go to settings -> project structure and examine the modules there is a red line under the app module. When I pass the cursor over it a message "Classpath entry invalid: "JBoss 4.0.1" " is displayed. The heop facility doesn't have any reference to this message and doesn't appear to have anything relative on classpath. Anybody have an idea what might be causing this? Thanks.

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