Project [redacted].xcodeproj cannot be opened because the project file cannot be parsed

I have a working rn project. I run the initial two installation steps

1. npm install react-native-fcm --save
2. react-native link react-native-fcm

When I then go to open [redacted].xcodeproj (which usually opens in xcode latest) I get presented with the following error message.

> "Project [redacted].xcodeproj cannot be opened because the project file cannot be parsed."

This only happens after I run the `link` command. The app runs perfectly otherwise - though obviously I cannot make use of react-native-fcm.

What version of RN and react-native-fcm are you running?

```
"react": "15.4.2",
"react-native": "^0.44.0",
"react-native-fcm": "^6.2.3",
```

What device are you using? (e.g iOS9 emulator, Android 6 device)?
n/a

Is your app running in foreground, background or not running?
n/a

Reproduce the problem in a React Native project using `npm install react-native-fcm --save` followed by `react-native link react-native-fcm`, then try opening the generated `.xcodeproj` in Xcode. Inspect the project file for the change that makes it unparsable; done means the project opens normally and the linked module remains usable.

Written by the indexing model from the issue text.