Removed module projects because it can't work like that atm. Commented out package commands.

NadekoBot.Core/Modules/Gambling/Common/AnimalRacing/Exceptions/AlreadyJoinedException.cs

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+using System;
+
+namespace NadekoBot.Modules.Gambling.Common.AnimalRacing.Exceptions
+{
+    public class AlreadyJoinedException : Exception
+    {
+        
+    }
+}

NadekoBot.Core/Modules/Gambling/Common/AnimalRacing/Exceptions/AlreadyStartedException.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace NadekoBot.Modules.Gambling.Common.AnimalRacing.Exceptions
+{
+    public class AlreadyStartedException : Exception
+    {
+        
+    }
+}

NadekoBot.Core/Modules/Gambling/Common/AnimalRacing/Exceptions/AnimalRaceFullException.cs

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+using System;
+
+namespace NadekoBot.Modules.Gambling.Common.AnimalRacing.Exceptions
+{
+    public class AnimalRaceFullException : Exception
+    {
+    }
+}

NadekoBot.Core/Modules/Gambling/Common/AnimalRacing/Exceptions/NotEnoughFundsException.cs

@@ -0,0 +1,9 @@
+using System;
+
+namespace NadekoBot.Modules.Gambling.Common.AnimalRacing.Exceptions
+{
+    public class NotEnoughFundsException : Exception
+    {
+        
+    }
+}