Error Installing Nuget Package. (Bot builder 4.1.5 ).

Hi ,

 

I am creating a chat bot using visual studio professional 2017(ver 15.8.8) .Installing

Nuget package (microsoft.bot.builder 4.2.5) It showing an Error like this.

 

Error :Could not install package 'Microsoft.Bot.Builder 4.1.5'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.6', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.

 

Please, any Idea?

 

Thank you.