Icon suggests 'Java class located out of the source root'

I am using Intellij 8.0.1 Build #9164 (although this doesn't seem relevant!) and seeing the icons suggesting that the Java class is ''located out of the source root' next to the methods in the class.  The external class is a replacemenbt for another similarly named but I do not seem to be able to get to a successful compilation with this new code.  Can anyone explain why this is and what I can try to resolve ?.  Next to the file after an attempted Build A> Rebuild Projectl I see the fateful 'package does not exist'.  Any help much appreciated !!

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