CCS/TMS320F28335: TMS320F28335

Tool/software: Code Composer Studio

Hi, have following error message when I debug my project after rebuild. Could you please guide me how I resolve this issue. thanks

Error connecting to the target:
(Error -151 @ 0x0)
One of the FTDI driver functions used during the connect
returned bad status or an error. The cause may be one or
more of: no XDS100 is plugged in, invalid XDS100 serial number,
blank XDS100 EEPROM, missing FTDI drivers, faulty USB cable.
Use the xds100serial command-line utility in the 'common/uscif'
folder to verify the XDS100 can be located.
(Emulation package 6.0.407.3)