notify on errors

journal3.py

@@ -20,11 +20,16 @@ async def on_message(message):
     await message.channel.send('generating channel archive...')
 
     with io.StringIO() as buf:
+        try:
             async for m in message.channel.history(limit=None, oldest_first=True):
                 buf.write('@{0.author.name}#{0.author.discriminator} {0.created_at}\n{0.clean_content}\n\n'.format(m))
             buf.seek(0)
             f = discord.File(buf, '{}_{}.txt'.format(message.channel.guild.name, message.channel.name))
             await message.channel.send('complete:', files=[f])
+        except discord.Forbidden:
+            await message.channel.send('Looks like I don\'t have the right permissions :( Please make sure I have the "Read Message History" and "Attach Files" permissions for this channel.')
+        except discord.DiscordException as e:
+            await message.channel.send("Something went wrong: {}".format(e))
 
 with open('token') as f:
     token = f.read().strip()