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Apr 29

Written by: Eric Rodwell
4/29/2010 12:59 PM 

After installing .NET Framework 4.0, I noticed that one of our applications we build has stopped working. Specifically users receive the following error:

[NET Framework Initialization Error] “Unable to find a version of the runtime to run this application."

To fix this problem, I had to update our application.config file (Application Name.exe.config) and add the following entry:

<configuration>
   <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v2.0.50727"/>
    <supportedRuntime version="v1.1.4322"/>
  </startup>
</configuration>

Once I saved the file and re-started the application, it started to work as expected.

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