Can't start thshaw/arc-welder

I already installed the XQuartz,but still get the error,
arc_1 | [1:1:0520/084722:ERROR:browser_main_loop.cc(231)] Gtk: cannot open display: “/private/tmp/com.apple.launchd.lQOoNJyclQ/org.macosforge.xquartz:0”

how can i do?