Fixes evanmiller#146 by checking for "ERROR" output.
Fixes evanmiller#146 by checking for "ERROR" output.

powermedia/ChicagoBoss,powermedia/ChicagoBoss,solatis/ChicagoBoss,7i11/ChicagoBoss,danikp/ChicagoBoss,uselessd/ChicagoBoss,synlay/ChicagoBoss,yunkai/ChicagoBoss,danikp/ChicagoBoss,aherranz/ChicagoBoss,ChicagoBoss/ChicagoBoss,lamptt/ChicagoBoss,lamptt/ChicagoBoss,uselessd/ChicagoBoss,frkarl/ChicagoBoss,frkarl/ChicagoBoss,solatis/ChicagoBoss,7i11/ChicagoBoss,yunkai/ChicagoBoss,synlay/ChicagoBoss,ChicagoBoss/ChicagoBoss,aherranz/ChicagoBoss