Share 'Could not acquire hardware tool communications resources: PICkit2PlatformTool'

Does anyone know how to solve this in MPLABX? I keep getting this message when I try to download the compiled program to the devBugger:"The programmer could not be started: Could not acquire hardware tool communications resources: PICkit2PlatformTool SN#<sn>OlHoss" It works fine with PICusb...