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Sometimes NB 6.0 shows the red error-icon-overlay over the package icon though no error-causing files/sources can be seen in either projects or files window. The task list is also empty for this project. This is reported elsewhere as well. See http://www.adam-bien.com/roller/abien/entry/first_workshop_with_netbeans_6beta
*** This issue has been marked as a duplicate of 104665 ***