Widget to image (screenshot) To PDF

I have found a solution to workarrounf the generation of PDF (Gemini helped me), but when i've done everything, an bizard issu occur :

A custom widget which i created to recieve widget as parameter is displaying widget but i unroll the parameter section, it shows "icon" type.

And even when i integrate the custom widget in the UI , the parameter still waiting an "icon" type data.

Here is the custom widget code 'if you want) :

// Automatic FlutterFlow imports
import '/backend/backend.dart';
import '/backend/schema/structs/index.dart';
import '/backend/schema/enums/enums.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 '/custom_code/actions/index.dart'; // Imports custom actions
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 'package:screenshot/screenshot.dart';
import 'dart:typed_data';
import 'dart:convert'; // Import for Base64 encoding

class CapturablePDFContent extends StatefulWidget {
  const CapturablePDFContent({
    Key? key,
    this.width,
    this.height,
    required this.contentToCapture,
    this.onCaptureCompleted,
  }) : super(key: key);

  final double? width;
  final double? height;
  final Widget contentToCapture;
  // The callback now expects a String (Base64 encoded)
  final Future<dynamic> Function(String? imageBytesBase64)? onCaptureCompleted;

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

class _CapturablePDFContentState extends State<CapturablePDFContent> {
  final ScreenshotController screenshotController = ScreenshotController();

  Future<void> captureContent() async {
    try {
      final Uint8List? capturedImage = await screenshotController.capture();

      if (capturedImage != null && widget.onCaptureCompleted != null) {
        // Encode Uint8List to Base64 String before passing
        final String imageBase64 = base64Encode(capturedImage);
        await widget.onCaptureCompleted!(imageBase64);
      }
    } catch (e) {
      print('Error capturing content for PDF: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Screenshot(
      controller: screenshotController,
      child: SizedBox(
        width: widget.width,
        height: widget.height,
        child: widget.contentToCapture,
      ),
    );
  }
}

// Set your widget name, define your parameter, and then add the
// boilerplate code using the green button on the right!