Game wont start

Suddenly my game wont start any more.
Here is the SMAPI error log:

[20:51:56 INFO SMAPI] SMAPI 2.7 with Stardew Valley 1.3.32 on Microsoft Windows 10 Pro
[20:51:56 DEBUG SMAPI] Mods go here: E:\SteamLibrary\steamapps\common\Stardew Valley\Mods
[20:51:56 TRACE SMAPI] Log started at 2018-11-19T19:51:56 UTC
[20:51:57 DEBUG SMAPI] Starting game...
[20:52:01 ERROR SMAPI] The game failed unexpectedly: System.MissingMethodException: Metoden blev ikke fundet: 'System.Collections.Generic.IEnumerable`1<StardewValley.Farmer> StardewValley.Game1.getOnlineFarmers()'.
ved StardewModdingAPI.Framework.SGame.Update(GameTime gameTime)
ved Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
ved Microsoft.Xna.Framework.Game.Run()
ved StardewModdingAPI.Program.RunInteractively() i C:\source\_Stardew\SMAPI\src\SMAPI\Program.cs:linje 304
[20:52:01 INFO SMAPI] Game has ended. Press any key to exit.

Can you help me.

I tried to delete the game and download again from Steam but it did not help.

 

Update your SMAPI to 2.8.1
after updating, iz should work again.

 

I updated smapi and restarted my computer yet I'm still having the same issue. Should I manually install smapi? I thought it was supposed to automatically update :/

 

You have to update manually and after that the game work again.
Thank you to Mobi Steinbaum for the help.