error while upload

[ivfdp]

i have been trying to upload the blink test on my cc3200-launchXL but there is an error. i already checked the jumpers are well connected but it still doesn't work. is there anything else that could cause this error?
Energia: 1.8.11E23 (Mac OS X), Board: "CC3200-LAUNCHXL (80MHz)"

Open UART /dev/cu.URT0
open UART success
UART Receive Timeout
Read ACK failed
Failed to trigger bootloader
An error occurred while uploading the sketch

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.