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I am trying to install a Named Instance of SQL Server 2017 in my computer. I selected Database Engine Services in the feature list before installation. The installation failed and I got the following not so informative error message.

The following error has occurred: Object reference not set to an instance of an object

I am using Windows 10 OS. I am running the setup as an Administrator. When asked to choose the authentication for the instance I chose Mixed Authentication.

Can someone tell me how to get past this problem.

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  • Read the sql server installation log file located at C:\Program Files\Microsoft SQL Server\114\Setup Bootstrap\Log\Summary.txt, also I have had similar issue and it was a corrupted installation media. Try downloading the installation files again. Commented Feb 15, 2018 at 21:44

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I had the same issue.

I use Win 10 1806. I run the reparation tool for .NET Framework, and it didn’t solve the problem.

In my case the installation file of MS SQL Server was corrupted.

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2 Comments

What was the solution?
download new installation file and rerun the installation
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This is most probably due to not having .NET Framework 4.6 installed. If it is already installed on your machine, you can try running the .NET Framework repair tool, found here

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I see .NET Framework 4.6 installed. I am going to try repairing.

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