[MAC OS] Problem with building monogame template

Hello All,

when installing the lattest version of monogame and the latest version of xamarin studio and create ios monogame template applicaiton,i get the following error :

Projects/gameOnce/gameOnce/gameOnce.csproj could not import "$(MSBuildExtensionsPath)\MonoGame\v3.0\MonoGame.Content.Builder.targets"