Got error to open a c# project "The tools version "14.0" is unrecognized"

Hi @all,

i want to open a c# project from github:

https://github.com/iotaledger/iota.lib.csharp

I wanted to open the project with sharpDevelop and got an error:

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Can't load file IotaCSharpApi.csproj under $path\IotaCSharpApi.

Check the file permission and the existence of that file.

The tools version "14.0" is unrecognized. Available tools versions are "2.0", "3.5", "4.0".  C:\tmp ew\iotaLibCsharp\IotaCSharpApi\IotaCSharpApi.csproj

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I am not quite if it is a bug or if its the user causing the error :)

Regards and thank you in advance,