Software⏱️ 2 min read📅 2026-05-31
How to Fix: Extender Provider failed to return an Extender
Quick Answer: Check if the Extender is enabled in the project properties, and ensure that the correct web.config file is being used.
📋 Table of Contents
The issue you're facing is a common problem when upgrading from .NET 2.0 to .NET 3.5, specifically with ASP.NET web projects in Visual Studio 2008.
💡 Why You Are Getting This Error
- [Cause]
✅ Best Solutions to Fix It
Method 1: Web.Config Renaming
- Step 1: Rename the existing web.config file to something like 'old_web_config' and create a new one with the default name.
Method 2: Web.Config Backup
- Step 1: Create a backup of the original web.config file before making any changes.
🎯 Final Words
By following these simple steps, you should be able to resolve the 'Extender Provider failed to return an Extender' error and get your ASP.NET web project up and running in Visual Studio 2008.
❓ Frequently Asked Questions
Step 1: Rename the existing web.config file to something like 'old_web_config' and create a new one with the default name.
Step 1: Create a backup of the original web.config file before making any changes.
By following these simple steps, you should be able to resolve the 'Extender Provider failed to return an Extender' error and get your ASP.NET web project up and running in Visual Studio 2008.
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