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Unable to find any ICDI devices

Other Parts Discussed in Thread: ENERGIA

Hi everyone, 
I'm a beginner in programming microcontrollors and i'm having a problem with the Tiva TM4C1294 LaunchPad, 
in fact when i'm connecting it to the USB port and load an example from ENERGIA IDE , I got this message "Unable to find any ICDI devices".
Please what should I do to fix my problem and start enjoying this launchpad :) ?
I'll be grateful for any help from anyone.