iOS App Not Run update Config Not found

[devalp-pro]

I m not use ConnectycubeFlutterCallKit.instance.updateConfig(ringtone: 'custom_ringtone', icon: 'app_icon', color: '#07711e'); This method even if when I run the app in in simulator it's give me error below.

[SwiftConnectycubeFlutterCallKitPlugin][handle] method: updateConfig
Could not cast value of type 'NSNull' (0x111ea6f50) to 'NSString' (0x111ea6f38).
2022-02-19 11:04:54.380348+0530 Runner[44844:321335] Could not cast value of type 'NSNull' (0x111ea6f50) to 'NSString' (0x111ea6f38).

[TatankaConCube]

our sample works well with this lib

[sanalkumar1991]

change ' let ringtone = arguments["ringtone"] as! String' and 'let icon = arguments["icon"] as! String' to ' let ringtone = arguments["ringtone"] as? String' and 'let icon = arguments["icon"] as? String' in ios/.symlinks/plugins/connectycube_flutter_call_kit/ios/Classes/SwiftConnectycubeFlutterCallKitPlugin.swift