BE0071: Unable to locate information for the project framework version 'XXXX'

Error BE0071: Unable to locate information for the project framework version 'XXXX' or a suitable redirected version on this system.

The build engine was unable to locate framework information for the version specified in the project's FrameworkVersion property. An attempt was made to redirect usage to a later version but none were found.

This can happen if you select a framework that is not installed on the system. For example, choosing an earlier version of the Silverlight framework. If the earlier version is not found, the build engine will attempt to redirect usage to a later version of the framework if one can be found on the system. If the specified version or a later version cannot be found, you will need to install the selected or later version of the framework specified in the project on the system.

The framework assemblies are searched for in the Reference Assemblies folder (%ProgramFiles(x86)\Reference Assemblies\Microsoft\Framework). If you have not installed a version of Visual Studio related to the indicated framework version or the related targeting pack, the reference assemblies may not exist there. The simplest solution is to download and install the appropriate targeting pack or copy the reference assemblies from another system that does have them.

If using the Sandcastle Help File Builder NuGet package, it may mean that you need to install one or more of the help file builder Reflection Data Set packages which contain the necessary files. If multiple versions of the platform package exist, install the latest release as it will cover all prior releases as well. Be sure to set the project's Component Path project property to the packages folder if it is not under the help file build project folder. Once installed and the component path is set, you may need to close and reopen the project in order for it to detect the newly installed files.

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