discord.net - C# Discord Bot opening then immediately shutting down -

whenever run discord bot code see terminal pop split second closes shows no errors @ all. output log mean didn't seem had errors put i'll post anyways incase needs it: https://pastebin.com/51bcdqwu

here code i'm using run bot:

using discord; using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; namespace discordbot {     public class discordbot     {         discordclient client;         public discordbot()         {             client = new discordclient(input =>             {                 input.loglevel = logseverity.info;                 input.loghandler = log;             });             client.executeandwait(async () =>             {             await client.connect("mzaymju1otm4mzaymzc3otg0.c9g5tq.x2iwvs6rbesn79soc9i9anuuzgi", tokentype.bot);             });         }         private void log(object sender, logmessageeventargs e)         {             console.writeline(e.message);         }     } }