Unable to start debugging. The Silverlight Developer Runtime is not installed.


Learn how to solve this error: Unable to start debugging. The Silverlight Developer Runtime is not installed. Please install a matching version.

My development laptop physically damaged recently and I had to switch over to another temporary laptop. It took about a day for me to install all dev software including Visual Studio 2010, SQL Server 2008 and many other software. After all the installations are done, I created a test project using Visual Studio and confirmed everything is alright. Then I went to my work place and I tried debugging my project. To my surprise, it came with the following message:

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Microsoft Visual Studio
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Unable to start debugging. The Silverlight Developer Runtime is not installed. Please install a matching version.
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debugging error

I thought I had setup everything and wasn't sure what is the role of Silverlight in debugging my ASP.NET project, which doesn't use any Silverlight components. Moreover, I already had Silverlight installed. But the problem was, my version of Silverlight was 5.0 but my Visual Studio version was expecting Silverlight 4.0. All I had to to solve the error was, install Silverlight Developer Runtime.

You can download Silverlight Developer Runtime and install on your computer to resolve this error.

Installation error: A newer version of Silverlight is already installed.


When I tried to install Silverlight, I received the following error:

Unable to install Silverlight.

A newer version of Silverlight is already installed.


This was because my computer had Silverlight 5.0 installed when I tried to install Silverlight 4.0.

All I had to do was, go to the "Add Remove Programs" and uninstall the Silverlight from there. After installing the newer version, I was able to install the Silverlight 4.0 and resolve the debugging error in Visual Studio.


Comments

Author: vasiraja06 Dec 2014 Member Level: Bronze   Points : 2

I was also getting the same error even after installing the latest error. I was resolved by the following steps.
In "Properties" of your project In "Web" menu under "Debugging" option please un check the check box "silverlight" oriented. Now save all and I hope that it will work fine.

Author: oraclefusion13 Mar 2017 Member Level: Bronze   Points : 0

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