Troubleshooting custom modules

This page describes how to resolve common errors that you may encounter when working with custom modules.

Modules missing in the application list

Problem: You have created, imported or installed a custom module that has its own administration pages, but the module’s application is missing in the application list. The problem may also occur with existing custom modules after you create or import a new site.


  • You may need to reload the entire Kentico administration page in your browser, including the header section.
  • Make sure the module is assigned to the currently active site:
    1. Open the Modules application in the Kentico administration interface.

    2. Edit your module.

    3. Switch to the Sites tab and assign the module to your sites.

      Tip: Alternatively, you can edit your sites in the Sites application and assign modules on the Assigned objects tab.

  • For users without the Administrator or Global administrator privilege level, you may need to ensure that the module has the Read permission defined and that the user has the given permission assigned.

See also:

Custom object types (classes) missing in selectors

Problem: You cannot find custom object types (module classes) in selectors within the administration interface. For example when setting the Object type in the properties of UI elements or the Reference to value in the settings of foreign key class fields.


  • If you are the developer of the custom module, make sure that you have generated the Info and InfoProvider code for the class. On web application type projects, you also need to include the code files into the project in Visual Studio and build the solution.
  • If your module code files are placed in a separate library, you need to allow the system to detect the classes. Make sure the AssemblyDiscoverable assembly attribute is added (typically in the AssemblyInfo.cs file of the custom project).
  • You may be missing the resource string representing the given object type name. If the resource string does not exist, the object type is available under the default name in format: ObjectType.<class code name with an underscore>

See also:

Module customizations not working on MVC sites

Problem: Your website is built using the MVC development model and you use modules to run custom initialization code that modifies the functionality of Kentico. However, the customization does not work when testing your MVC live site.

Solution: You may need to deploy the assembly containing your module’s code to the separate MVC application (in addition to the Kentico administration project). This is necessary for any modules that customize the system’s live site functionality, or if you wish to display or otherwise use the data of module classes in your MVC application.

When deploying the module project to your MVC solution, we recommend adding references to Kentico API libraries via the Kentico.Libraries NuGet package, which is installed in the MVC web project.