rpc: json response error when tried to call listchannel using rpc call

[KAVAN-DESAI]

StackTrace

┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
│ #0   LogManager.debug (package:cln_common/src/logger/logger_manager.dart:16:13)
│ #1   new AppChannels.fromJSON (package:clnapp/model/app_model/list_channels.dart:39:28)
├┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄┄
│ 🐛 {source: 02312627fdf07fbdd7e5ddb136611bdde9b00d26821d14d94891395452f67af248, destination: 02ec99e98f3f3a5e300bebb12a49d5b72d77a55796808a8f5b2e6b42f3db51c7cf, short_channel_id: 2281622x42x1, public: true, satoshis: 20000, amount_msat: 20000000msat, message_flags: 1, channel_flags: 0, active: true, last_update: 1658752225, base_fee_millisatoshi: 1000, fee_per_millionth: 1, delay: 40, htlc_minimum_msat: 1000msat, htlc_maximum_msat: 20000000msat, features: }
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
00:46 +2 -2: clnapp unix_client tests API List Channels [E]                                                                                                                                        
  type 'String' is not a subtype of type 'Map<String, dynamic>' in type cast
  package:clnapp/model/app_model/list_channels.dart 44:9   new AppChannels.fromJSON
  package:clnapp/model/app_model/list_channels.dart 15:41  new AppListChannels.fromJSON.<fn>
  dart:_internal                                           ListIterable.toList
  package:clnapp/model/app_model/list_channels.dart 16:12  new AppListChannels.fromJSON
  package:clnapp/api/cln/cln_client.dart 116:53            CLNApi.listChannels.<fn>
  package:clightning_rpc/src/clightning_rpc.dart 36:22     RPCClient.call