Coding⏱️ 3 min read📅 2026-06-11

How to Fix: Visual Studio 2015 Application properties window null reference error

Learn how to fix: Visual Studio 2015 Application properties window null reference error.

Quick Answer: Try checking your system settings or restarting.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

Visual Studio 2015 Application properties window null reference error occurs when trying to load the page, resulting in an error message that indicates 'Value cannot be null' and points to a specific parameter. This issue affects users of Visual Studio 2015 Update 2 who have recently installed packages such as NuGet Package Manager and Codemaid.

This error can be frustrating for developers, especially when they are unable to identify the cause or find an immediate solution. In this troubleshooting guide, we will walk through the possible causes and provide steps to resolve the issue.

⚠️ Common Causes

  • The primary reason for this error is a compatibility issue between the newly installed packages and the existing version of Visual Studio 2015 Update 2. Specifically, the Codemaid package may be causing conflicts with the Project.CommonProjectExtender class.
  • An alternative cause could be a corrupted or outdated installation of the .NET Framework, which might lead to issues with the Microsoft.VisualStudio.ProjectFlavoring.Automation namespace.

✅ Best Solutions to Fix It

Updating the Codemaid Package

  1. Step 1: Open the NuGet Package Manager in Visual Studio and search for the Codemaid package. If it is installed, click on 'Update' to update it to the latest version.
  2. Step 2: If the package is not installed, install it using the NuGet Package Manager. Then, try loading the properties window again to see if the issue persists.
  3. Step 3: Alternatively, you can try uninstalling and reinstalling the Codemaid package. This may resolve any conflicts with the Project.CommonProjectExtender class.

Updating the .NET Framework

  1. Step 1: Check for updates to the .NET Framework and install the latest version. You can do this through the Microsoft website or by using the built-in update feature in Visual Studio.
  2. Step 2: If updating the .NET Framework does not resolve the issue, try reinstalling it from scratch.

✨ Wrapping Up

To summarize, the null reference error in Visual Studio 2015 Application properties window is typically caused by a compatibility issue with the Codemaid package or an outdated installation of the .NET Framework. By updating the Codemaid package and ensuring that the .NET Framework is up-to-date, you should be able to resolve the issue and continue working on your projects without any disruptions.

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