Target of URI doesn't exist: '/flutter_flow/flutter_flow_audio_player.dart'

I would like to create CustomWidget similar to FlutterFlowAudioPlayer, but with the possibility to change AudioPath from variable. So far I just copied the FlutterFlowAudioPlayer code from HomePage code and added import: '/flutter_flow/flutter_flow_audio_player.dart', what gives me this error:

Target of URI doesn't exist: '/flutter_flow/flutter_flow_audio_player.dart'. Try creating the file referenced by the URI, or try using a URI for a file that does exist.

Here is what I exactly did:

1) I added new Custom Widget with name AudioPlayerCustom

2) I pasted following code to it:

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/schema/structs/index.dart';
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/widgets/index.dart'; // Imports other custom widgets
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom widget code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

import '/flutter_flow/flutter_flow_audio_player.dart';
import 'package:assets_audio_player/assets_audio_player.dart';

class NewCustomWidget extends StatefulWidget {
  const NewCustomWidget({
    Key? key,
    this.width,
    this.height,
    this.audioPath,
  }) : super(key: key);

  final double? width;
  final double? height;
  final String? audioPath;

  @override
  _NewCustomWidgetState createState() => _NewCustomWidgetState();
}

class _NewCustomWidgetState extends State<NewCustomWidget> {
  @override
  Widget build(BuildContext context) {
    return FlutterFlowAudioPlayer(
      audio: Audio.network(
        FFAppState().buttons[FFAppState().indexOfPressedButton].audio,
        metas: Metas(
          id: 'sample3.mp3-cda06bb5',
        ),
      ),
      titleTextStyle: FlutterFlowTheme.of(context).titleLarge,
      playbackDurationTextStyle: FlutterFlowTheme.of(context).labelMedium,
      fillColor: FlutterFlowTheme.of(context).secondaryBackground,
      playbackButtonColor: FlutterFlowTheme.of(context).primary,
      activeTrackColor: FlutterFlowTheme.of(context).alternate,
      elevation: 0,
      playInBackground: PlayInBackground.disabledRestoreOnForeground,
    );
  }
}

3) To Pubspec dependencies in right panel I added this dependency: assets_audio_player: 3.0.6 and pressed the update button. (I didn't find in which format should I add flutter_flow_audio_player dependency, but it actually is defined in pubspec.yaml file so, is there a need to add it again?)

4) Saved and checked for errors, what threw the above mentioned error.

Thank you for response!

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