Software⏱️ 3 min read📅 2026-06-04

How to Fix: An error occurred while validating. HRESULT = '8000000A'

Error HRESULT = 8000000A occurs during automatic builds with Visual Studio, likely due to a dependency issue or corrupted project files. Refreshing dependencies and checking for source control coding issues may not be sufficient.

Quick Answer: Try disabling any recently installed extensions or plugins in Visual Studio, as they might be causing the issue.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

The error '8000000A' while validating in Visual Studio's devenv tool is an HRESULT code that indicates a problem with the project's dependencies. This error can be frustrating, especially when it occurs randomly during automatic builds, affecting different deployment projects each time.

This issue can be particularly challenging to resolve because the usual solutions, such as refreshing dependencies or removing source control coding from projects, do not seem to apply to automatic builds. In this guide, we will explore possible root causes and provide steps to troubleshoot and fix this error.

💡 Why You Are Getting This Error

  • One main reason for this error is a mismatch between the project's referenced assemblies and the versions installed on the target machine. When a project references an assembly that is not present or has a different version than expected, the validation process fails, resulting in the '8000000A' HRESULT code.
  • Another possible cause could be issues with the project's configuration or build settings. This might include incorrect platform builds, incompatible compiler versions, or other build-related settings that affect the project's dependencies.

🔧 Proven Troubleshooting Steps

Reconfiguring Project References and Build Settings

  1. Step 1: Step 1: Open the project properties by right-clicking on the project in Solution Explorer and selecting 'Properties'. In the 'Application' tab, verify that the Target Framework is correct for your deployment environment.
  2. Step 2: Step 2: Check the project's References section to ensure all required assemblies are correctly referenced. If an assembly is missing or has a different version than expected, update its reference accordingly.
  3. Step 3: Step 3: Review and adjust any build-related settings in the project properties, such as platform builds, compiler versions, or other configurations that might be affecting dependencies.

Resetting Project Configuration

  1. Step 1: Step 1: Open the 'Package' property page for your project by right-clicking on the project in Solution Explorer and selecting 'Package'. In the 'Package' section, click on the '...' button next to 'Project Output' and select 'Create Package'.
  2. Step 2: Step 2: In the 'Package' dialog box, verify that the correct configuration is selected for your deployment environment. If necessary, adjust the configuration settings and try rebuilding the project.

✨ Wrapping Up

By following these steps, you should be able to resolve the '8000000A' HRESULT code error in Visual Studio's devenv tool. Remember to carefully review your project references, build settings, and configurations to ensure a smooth validation process during automatic builds.

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