Fix error output on failure

bin/vagrant

@@ -251,7 +251,7 @@ rescue Exception => e
 
   if env
     opts = { prefix: false }
-    env.ui.error e.message, opts if e.message
+    env.ui.error(e.message, **opts) if e.message
     env.ui.machine("error-exit", e.class.to_s, e.message.to_s)
   else
     $stderr.puts "Vagrant failed to initialize at a very early stage:\n\n"