The problem is resolved using cloth 3.7.1 with cocoa pods :
Installed fabric with:
pod 'Fabric'
pod 'Crashlytics'
Now import below the two headers in the class "AppDelegate.h"
#import <Fabric/Fabric.h> #import <Crashlytics/Crashlytics.h>
Add the line below to didFinishLaunchingWithOptions: (NSDictionary *) launchOptions:
[Cloth with: @ [[Crashlytics Class]]];
The shell script has been updated with the root <forage path> with the fabric key, which will be generated when tissue registration is set in the assembly phase , as shown below:

and added the Api key in plist, as shown:

With this integration, Crashlytics now shows all live device scores, a crash in the App Store with build versions and active users
Link: https://docs.fabric.io/apple/examples/cannonball/index.html
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