message: Custom error message
  How to use 'say' function is wrong.
  So it has become difficult to understand.
diff: @@ -264,7 +264,7 @@ async function installBot(bot_vars) {
  exec(action, function(err, stdout, stderr) {
  if (err) {
  say('An error occurred. You may already have that starter kit installed.');
  - say('Error:', err);
  + say('Error:' + err);
  } else {
  if (bot_vars.studio_token) {
  writeStudioToken(bot_vars, function() {
  