duplicate class: warning for all classes in a single package

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Hi all

I'm getting a warning I have not seen before...
All classes in a single package in my project have been flagged with the red warning icon - the message reads: duplicate class: path.to.Class

The classes concerned are not duplicated in the project are not referenced in any library - and the project builds just fine - including the marked classes.

Any suggestions on how to clear the problem?

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problem solved - I just deleted the cache

I'd like to know why it happened though