Description
You may be receiving this error if you have 2 programming headers (JTAG and Active Serial (AS)) on your board and are trying to program the EPCS device directly but are connected to the JTAG header. If you are directly programming the EPCS device you will need to make sure you have the programming cable connected to the AS programming header.
You also may get this error if you have a noisy TCK signal or if the JTAG or AS header are not powered with the correct voltage.