Hi I could not solve the error, I would be very happy if you help me.

'package:flutter/src/painting/_network_image_io.dart': Failed assertion: line 25 pos 11: 'url != null': is not true.

/// The dart:io implementation of [image_provider.NetworkImage]. @immutable class NetworkImage extends image_provider.ImageProvider<image_provider.NetworkImage> implements image_provider.NetworkImage { /// Creates an object that fetches the image at the given URL. /// /// The arguments [url] and [scale] must not be null. const NetworkImage(this.url, { this.scale = 1.0, this.headers }) :assert(url != null ), assert(scale != null);

@override final String url;

@override final double scale;

@override final Map<String, String>? headers;

@override Future obtainKey(image_provider.ImageConfiguration configuration) { return SynchronousFuture(this); }

@override ImageStreamCompleter load(image_provider.NetworkImage key, image_provider.DecoderCallback decode) { // Ownership of this controller is handed off to [_loadAsync]; it is that // method's responsibility to close the controller's stream when the image // has been loaded or an error is thrown. final StreamController chunkEvents = StreamController();

return MultiFrameImageStreamCompleter(
  codec: _loadAsync(key as NetworkImage, chunkEvents, decode),
  chunkEvents: chunkEvents.stream,
  scale: key.scale,
  debugLabel: key.url,
  informationCollector: () {
    return <DiagnosticsNode>[
      DiagnosticsProperty<image_provider.ImageProvider>('Image provider', this),
      DiagnosticsProperty<image_provider.NetworkImage>('Image key', key),
    ];
  },
);

}

// Do not access this field directly; use [_httpClient] instead. // We set autoUncompress to false to ensure that we can trust the value of // the Content-Length HTTP header. We automatically uncompress the content // in our call to [consolidateHttpClientResponseBytes]. static final HttpClient _sharedHttpClient = HttpClient()..autoUncompress = false;

static HttpClient get _httpClient { HttpClient client = _sharedHttpClient; assert(() { if (debugNetworkImageHttpClientProvider != null) client = debugNetworkImageHttpClientProvider!(); return true; }()); return client; }

Future<ui.Codec> _loadAsync( NetworkImage key, StreamController chunkEvents, image_provider.DecoderCallback decode, ) async { try { assert(key == this);

  final Uri resolved = Uri.base.resolve(key.url);

  final HttpClientRequest request = await _httpClient.getUrl(resolved);

  headers?.forEach((String name, String value) {
    request.headers.add(name, value);
  });
  final HttpClientResponse response = await request.close();
  if (response.statusCode != HttpStatus.ok) {
    // The network may be only temporarily unavailable, or the file will be
    // added on the server later. Avoid having future calls to resolve
    // fail to check the network again.
    await response.drain<List<int>>();
    throw image_provider.NetworkImageLoadException(statusCode: response.statusCode, uri: resolved);
  }

  final Uint8List bytes = await consolidateHttpClientResponseBytes(
    response,
    onBytesReceived: (int cumulative, int? total) {
      chunkEvents.add(ImageChunkEvent(
        cumulativeBytesLoaded: cumulative,
        expectedTotalBytes: total,
      ));
    },
  );
  if (bytes.lengthInBytes == 0)
    throw Exception('NetworkImage is an empty file: $resolved');

  return decode(bytes);
} catch (e) {
  // Depending on where the exception was thrown, the image cache may not
  // have had a chance to track the key in the cache at all.
  // Schedule a microtask to give the cache a chance to add the key.
  scheduleMicrotask(() {
    PaintingBinding.instance!.imageCache!.evict(key);
  });
  rethrow;
} finally {
  chunkEvents.close();
}

}

@override bool operator ==(Object other) { if (other.runtimeType != runtimeType) return false; return other is NetworkImage && other.url == url && other.scale == scale; }

@override int get hashCode => ui.hashValues(url, scale);

@override String toString() => '${objectRuntimeType(this, 'NetworkImage')}("$url", scale: $scale)'; }

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