@ -58,7 +58,7 @@ def define_command text, options
begin
yield event
rescue => err
$study_channel.send "```rb\n#{PP.pp(err, "")}\n```"
$study_channel.send "```rb\n#{PP.pp(err, "")}\n#{PP.pp(err.backtrace.join("\n"), "")}\n```"
end