Unable to fetch the dependencies ./Scripts/bootstrap.sh -d in appium

I am trying to do the setup for appium real device, when am doing the below operation, it just gives the message as fetching dependencies but nothing is showing up i think due to that unable to build the project too

below are the steps am following

mkdir -p Resources/WebDriverAgent.bundle
./Scripts/bootstrap.sh -d

Following the steps in the below link https://github.com/imurchie/appium-xcuitest-driver/blob/isaac-rs/docs/real-device-config.md#basic-manual-configuration

Config Details

OS : 10.12.4
Xcode: 8.3
Appium ; 1.6.3