Kindly ensure that the option to power POD externally is checked if you want it to power externally. Please go to Project >> Settings >> Debugger and check the option: "POD is powered externally". If pod has to be powered by ICE then please go to Project >> Settings >> Debugger and check the option ICE to power POD.
Also, this error occurs when the ICE is unable to talk to a POD on the other side. So, please make sure that the POD is connected and that the POD is not dead for some reason.