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hi,@ltfschoen. When I debug interface getAccountLockedClaimsApprovedOfMXCAmountFromDataHighwayMXCMiningContract, it reports one exception, which it ran its code.

and My abiCode is here.

Flutter Excetpion:
`E/flutter (11893): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: Bad state: No element

E/flutter (11893): #0 ListMixin.singleWhere (dart:collection/list.dart:185:5)

E/flutter (11893): #1 DeployedContract.event
package:web3dart/…/contracts/deployed_contract.dart:42

E/flutter (11893): #2 EthereumApiMiningMXC.getAccountLockedClaimsApprovedOfMXCAmountFromDataHighwayMXCMiningContract
package:polka_wallet/…/ethereumApi/apiMiningMXC.dart:421

E/flutter (11893):

E/flutter (11893): #3 Ethereum.fetchMXCLockedClaimsApproved
package:polka_wallet/…/ethereumApi/api.dart:68

E/flutter (11893):

E/flutter (11893): #4 Ethereum.init
package:polka_wallet/…/ethereumApi/api.dart:40

E/flutter (11893):

E/flutter (11893): #5 _WalletAppState._initStore
package:polka_wallet/app.dart:104

E/flutter (11893): #6 _asyncThenWrapperHelper. (dart:async-patch/async_patch.dart:73:64)

E/flutter (11893): #7 _rootRunUnary (dart:async/zone.dart:1134:38)

E/flutter (11893): #8 _CustomZone.runUnary (dart:async/zone.dart:1031:19)

E/flutter (11893): #9 _FutureListener.handleValue (dart:async/future_impl.dart:139:18)

E/flutter (11893): #10 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:680:45)

E/flutter (11893): polkawallet-io#11 Future._propagateToListeners (dart:async/future_impl.dart:709:32)

E/flutter (11893): polkawallet-io#12 Future._completeWithValue (dart:async/future_impl.dart:524:5)

E/flutter (11893): polkawallet-io#13 _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:32:15)
`

It causes that I can not get the right result.

this is my branch develop_sam, and run this project, it would show this issue:

I/chromium(15810): [INFO:CONSOLE(33)] "WebSocket connection to 'wss://testnet-harbour.datahighway.com/' failed: Error in connection establishment: net::ERR_NAME_NOT_RESOLVED", source: (33)

no more detail to view in the error log.

hi, @ltfschoen. When I ran the code, it appears the issue as follows, but it can not stop me to get the correct result. However, I think it should have some effects if it runs successfully.

The Flutter Exception:
[ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: WebSocketChannelException: WebSocketChannelException: WebSocketException: Connection to 'https://mainnet.infura.io:0/v3/031a0a2b799c44a0b3539c1e86e6cbd9#' was not upgraded to websocket