Error building hololens app : GestureRecognizer could not be found

Hello, I'm following the tutorial here (https://developer.microsoft.com/en-us/windows/mixed-reality/holograms_101e) to build a hololens app, but whenever I try and build the project I get the following errors: Assets\Holograms\Support\Fitbox\Fitbox.cs(43,26): error CS0246: The type or namespace name 'GestureRecognizer' could not be found (are you missing a using directive or an assembly reference?) Error building Player because scripts had compiler errors UnityEditor.BuildPlayerWindow+BuildMethodException: Build failed with errors. at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x001b9] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:162 at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00050] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:83 UnityEditor.HostView:OnGUI() I'm using Unity 2017.1. Any possible solutions? I've tried seeing why it can't find the namespace but can't find a solution yet. Any help will be really appreciated. Thanks, Andrew Solis