CC MP157 remoteproc issue

I am unable to get an M4 executable (*.elf) file to run remotely on the M4 using remoteproc. I followed the instructions here:

https://www.digi.com/resources/documentation/digidocs/embedded/dey/4.0/ccmp15/yocto-develop-cortex-apps_t_ccmp15.html

And I built an M4 executable, downloaded it to the CC MP157 dev kit, moved it to /lib/firmware/, and then attempted to load it using the echo command. The echo command fails with, “No such file or directory”. I believe the main reason is that /sys/class/remoteproc/remoteproc0 doesn’t exist in the file system, but I have no idea why. I’ve included a screenshot of me trying to load the M4 elf file.

Thanks for any help you can provide!