Install NuGet package using Package Manager Console of Visual Studio

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This video explains how to Install System.Web.Optimization DLL Nuget package using Package Manager Console of Visual Studio.
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Hello
do you can help me whit error on Package Manager Console, doesn't run any command, star with Build started, stop and show me this error: Build failed:

drop-database
Multiple startup projects set.
Using project 'Project.Backend' as the startup project.
Multiple startup projects set.
Using project 'Proyect.Backend' as the startup project.
Build started...
Build failed.

I appreciate your help
thanks

napoleonmejia