CCS/IWR1642BOOST: Path error when importing MSS and DSS from 16xx - mmWave SDK Demo from Resource Explorer to CCS IDE

Tool/software: Code Composer Studio

Error message is 

Error: Path 'COM_TI_MMWAVE_SDK_INSTALL_DIR/packages/ti/demo/xwr16xx/mmw/mss/mss_main.c" cannot be resolved

Same for mss_mmw.cfg, mss_mmw.h, cli.c, and mss_mmw_linker.cmd.

Is there something I need to do to set the path name.  If so, where should I look for the files?

I have been following the steps in the xWR16xx mmWave Demo user guide.

On a good note, the out-of-the-box demos does work with the IWR1642BOOST and the viewer.

Thanks for any help.

Glenn