diff --git a/isometric-park-fna/isometric-park-fna-core.csproj b/isometric-park-fna/isometric-park-fna-core.csproj
--- a/isometric-park-fna/isometric-park-fna-core.csproj
+++ b/isometric-park-fna/isometric-park-fna-core.csproj
@@ -37,7 +37,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Reference Include="System" />
     <Reference Include="Newtonsoft.Json" Version="12.0.3">
       <HintPath>..\packages\Newtonsoft.Json.12.0.3\lib\netstandard2.0\Newtonsoft.Json.dll</HintPath>
     </Reference>