I think error -2 is a “no such file or directory” error.
I suspect you are missing the firmware file for your wifi chip, iwlwifi-3160-17.ucode.
These files are usually under stupid licences that do not allow re-distribution, so they are not included in the OS install, and need to be installed afterwards.
I looks like you can get the file you need from here: https://github.com/OpenELEC/iwlwifi-firmware/tree/master/firmware (I just found this with google).
But I’m not sure where in the filesystem you need to put it, possibly under /lib/firmware/