Not able to run the repo, getting "Command PhaseScriptExecution failed with a nonzero exit code"

[userException]

Steps:

1. I downloaded this repo
2. Ran "sudo npm install --save react-native-ble-plx" inside the downloaded folder.

Got this warning: "npm WARN react-native@0.57.5 requires a peer of react@16.6.1 but none is installed. You must install peer dependencies yourself."
3. Ran "sudo react-native link react-native-ble-plx" inside the downloaded folder
Got this info:
rnpm-install info Platform 'ios' module react-native-ble-plx is already linked
rnpm-install info Platform 'android' module react-native-ble-plx is already linked

But when I run it from xcode, I see this error: Command PhaseScriptExecution failed with a nonzero exit code

[Taym95]

Why do you want to install react-native-ble-plx again? it's already installed! check package.json.