This solution should help me explain my desire

SharedLibrary/Models/RepositoryError.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SharedLibrary.Models
+{
+    public class RepositoryError 
+    {
+        public string Information { get; set; }
+        public string StackTrack { get; set; }
+    }
+}

SharedLibrary/Models/RepositoryException.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SharedLibrary.Models
+{
+    public class RepositoryException : Exception
+    {
+        
+    }
+}

SharedLibrary/SharedLibrary.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>