nrfjprog --pinreset return error code 8

[MR.liu]

when i use nrfjprog.exe download my application code,Change nrfjprog.exe --eraseall --program ble_module.hex --verify --reset to nrfjprog.exe --eraseall --program ble_module.hex --verify --pinreset ，then return error code 8

[MR.liu]

CHIP IS NRF51822，nrfjprog version is 5.1.1.43514