Coding⏱️ 2 min read📅 2026-06-02

How to Fix: Why am I getting an Exception with the message "Invalid setup on a non-virtual (overridable in VB) member..."?

Fix Why am I getting an Exception with the message &qu. Use the “It’s a new feature’ approach to. Step-by-step guide included.

Quick Answer: Use the “It’s a new feature’ approach to mock the method, or use a library like Moq to create a mock object for the method.

📋 Table of Contents

  1. 🛠️ Step-by-Step Verified Fixes
  2. ✨ Wrapping Up

The issue you're encountering is due to the non-virtual method call in your unit test. When using mock objects, it's crucial to ensure that the methods being mocked are virtual.

🛠️ Step-by-Step Verified Fixes

Method 1: Make the Method Virtual

  1. Step 1: Open your XmlCupboardAccess class and add the "virtual" keyword to the IsDataEntityInXmlCupboard method.

Method 2: Use a Mock Framework

  1. Step 1: Install a mocking library such as Moq or NSubstitute in your project.

✨ Wrapping Up

By applying one of these solutions, you should be able to resolve the Invalid setup on a non-virtual (overridable in VB) member exception and successfully run your unit tests.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Stuck in tutorial hell after 4 years: How do I b

Fix Stuck in tutorial hell after 4 years: How do I bui. Practice build

How to Fix: Trying to sync mutliple audio tracks to a movie

Fix Trying to sync mutliple audio tracks to a movie bu. Consider using

How to Fix: Failed to merge latest branches from upstream re

Fix Failed to merge latest branches from upstream repo. Try running 'g