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errors debugging real board

Other Parts Discussed in Thread: EK-TM4C123GXL

I'm new to ARM and I'm working with my son who loves robotics.  Please help with debugging errors.  I am getting a "Could not find an Cortex-M device in the JTAG chain! Please check the JTAG cable and the connected devices error."  Has anyone come across this issue or knows how to resolve.? Thank you.