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Product Version: NetBeans IDE 8.1 (Build 201510222201) Updates: NetBeans IDE is updated to version NetBeans 8.1 Patch 1 Java: 1.8.0_72; Java HotSpot(TM) 64-Bit Server VM 25.72-b15 Runtime: Java(TM) SE Runtime Environment 1.8.0_72-b15 System: Windows 8.1 version 6.3 running on amd64; Cp1252; en_GB (nb) I work on a product which has dependencies that come from a number of git repositories. I regularly change branch from command line, which I suspect may be the reason for this problem. I get "package <one of my own> does not exist" yet I get no such error when opening the same maven project in Eclipse. It also builds fine in NetBeans and from CLI. In NetBeans explorer, under Dependencies, I can even navigate to the package. Amongst the things I tried are.... - "mvn clean pacakge", from CLI - clean and build, from NetBeans - deleted my local maven repo and rebuilt everything, and re-opened NetBeans - closed NetBeans, deleted cache, opened NetBeans Eventually, I just re-installed NetBeans and finally the false error has gone.