Update

Controllers/AdminController.cs

@@ -43,11 +43,6 @@ namespace PSTW_CentralSystem.Controllers
             return View(moduleSettings);
         }
 
-        public IActionResult AddModule()
-        {
-            return View();
-        }
-
         public IActionResult ModuleCreate()
         {
             return View();

Views/Admin/ModuleAdmin.cshtml

@@ -7,7 +7,7 @@
 }
 
 <p>
-    <a asp-action="CreateModule">Create New</a>
+    <a asp-action="ModuleCreate">Create New</a>
 </p>
 <div class="row" id="app">
     <div class="col-md-12 col-lg-12">