Kentico 9 Sudden Malfunction

Hi Fuad,

This happens due to windows and .NET update where microsoft added a method with same signature as the one we had already created within our API. The solution:

Upgrade to v10 or higher

Roll back the Windows update

Use web application project

Change code in \CMS\App_Code\CMS\UpgradeProcedure.cs: From: .ToDictionary(group => group.Key, group => group.Select(u => u.Email).ToHashSet(StringComparer.InvariantCultureIgnoreCase));

To: .ToDictionary(group => group.Key, group => CMS.DataEngine.DataExtensions.ToHashSet(group.Select(u => u.Email), StringComparer.InvariantCultureIgnoreCase));

Do you have details about the .NET update that causes the problem?

Just hit the problem on my development machine and the code change worked, but would be handy to know which update caused the problem.

Edit: Just seen the KB link on the page, so please ignore.

We encountered this in Production in Azure today, Microsoft must have updated their services and all at once all environments including Production went down.

We had to rename the offending file wwwroot\App_Code\CMS\UpgradeProcedure.cs to wwwroot\App_Code\CMS\UpgradeProcedure.cs.broken

Hi Brett,
You can follow the article mentioned above to fix the issue. Also, Microsoft announced that the .Net version will be changed back in April and the release was also postponed in August.