make config file errors more understandable to the user
make config file errors more understandable to the user

Signed-off-by: Jordan Wilberding <220780119b0515e812290c52572d947e9668976c@gmail.com>

zugolosian/relx,RJ/relx,timclassic/relx,tsloughter/relx,lrascao/relx,erlware/relx,ingwinlu/relx,bitwalker/relx,Licenser/relx,ethercrow/relx,priestjim/relx,bsmr-erlang/relx,umatomba/relx,syl20bnr/relx