I have apply Firebase Crashlytics in my app. I have implemented the following in my Run Script, under Build Phases in Xcode:
[![enter image description here](https://i.stack.imgur.com/Bh9mp.png)](https://i.stack.imgur.com/Bh9mp.png)

I also config into Build Settings:

[![enter image description here](https://i.stack.imgur.com/in3hx.png)](https://i.stack.imgur.com/in3hx.png)

and the message I receive when Xcode building :

`Running upload-symbols in Build Phase mode`

`Validating build environment for Crashlytics...`

`Validation succeeded. Exiting because upload-symbols was run in validation mode Fetching upload-symbols settings...`

`Command PhaseScriptExecution failed with a nonzero exit code`

Has anyone had success in implementing the upload-symbols script in their Run Script? Any ideas why my Build stalls and never finishes