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I use the NB 6.9.1. Steps to reproduce: - Run a midlet The Emulator is staring - Edit a midlet - Run a midlet again without the Emulator closing The error appears: --------------------------------------------------------------------- Jad URL for OTA execution: http://localhost:8082/servlet/org.netbeans.modules.mobility.project.jam.JAMServlet/D%3A/projects/demos/ContactlessTest/dist//ContactlessTest.jad Starting emulator in execution mode Installing suite from: http://127.0.0.1:1593/ContactlessTest.jad *** Error *** A problem occurred during deploying application from http://127.0.0.1:1593/ContactlessTest.jad Reason: MIDlet suite is already running. D:\projects\demos\ContactlessTest\nbproject\build-impl.xml:898: Execution failed with error code 1. BUILD FAILED (total time: 10 seconds) --------------------------------------------------------------------- It is better to run the updated midlet in the already open emulator.