error

[abolfazlMKazemi]

i use this code but get error
"
E/flutter ( 2251): Bad state: Too few elements
E/flutter ( 2251): #0 _TypedListBase.setRange (dart:typed_data-patch/typed_data_patch.dart:125:11)
E/flutter ( 2251): #1 _IntListMixin.setRange (dart:typed_data-patch/typed_data_patch.dart)
E/flutter ( 2251): #2 HDPrivateKey._deriveChildPrivateKey (package:dartsv/src/hdprivatekey.dart:202:15)
E/flutter ( 2251): #3 HDPrivateKey.deriveChildKey (package:dartsv/src/hdprivatekey.dart:143:19)
E/flutter ( 2251): #4 WalletDatasource.generateHdAddressFromNemonic. (package:zixowallet/data/datasources/wallet.datasource.dart:221:26)
E/flutter ( 2251): #5 _delayEntrypointInvocation. (dart:isolate-patch/isolate_patch.dart:300:17)
E/flutter ( 2251): #6 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)
E/flutter ( 2251): [ERROR:flutter/runtime/dart_isolate.cc(1097)] Unhandled exception:
"

and my code is
print(
"type is ${type} and index is ${index} and address is m/44/236/0/${type}/${index}");

    print("vvvvvvvvvvvvvvvvvvvv ${hdPrivateKey}");

    HDPrivateKey derivedKey =
        hdPrivateKey.deriveChildKey('m/44/236/0/${type}/${index}');//this line has error

and value in log console is
I/flutter ( 2251): type is 1 and index is 39 and address is m/44/236/0/1/39
I/flutter ( 2251): vvvvvvvvvvvvvvvvvvvv tprv8ZgxMBicQKsPdArVcmqsQPUJJHZbuXZjL59bGVKCkkiUbjjEyfZbZW7Xx6Nx3JKXVMtaNj9968A3EiE

[abolfazlMKazemi]

please help me