Artemis Dev Kit fail to upload

I have some problem uploading the code to Artemis Dev Kit right now. When I copy the bin file into the dev kit, it will automatically eject. And when it connects to my computer again, there’s a file “FAIL.TXT”. Here is the content:"error: The interface firmware FAILED to reset/halt the target MCU

type: target". I’ve tried to upload the code several times but no luck. What can I do now?