show error message on image error

lib/src/message_widget.dart

@@ -879,11 +879,7 @@ class _MessageWidgetState extends State<MessageWidget>
   Widget _buildImage(
     Attachment attachment,
   ) {
-    return CachedNetworkImage(
+    final errorWidget = Container(
-      imageUrl:
-          attachment.thumbUrl ?? attachment.imageUrl ?? attachment.assetUrl,
-      errorWidget: (context, url, error) {
-        return Container(
       width: 200,
       height: 140,
       color: Color(0xffd0021B).withAlpha(26),
@@ -894,6 +890,18 @@ class _MessageWidgetState extends State<MessageWidget>
         ),
       ),
     );
+
+    if (attachment.thumbUrl == null &&
+        attachment.imageUrl == null &&
+        attachment.assetUrl == null) {
+      return errorWidget;
+    }
+
+    return CachedNetworkImage(
+      imageUrl:
+          attachment.thumbUrl ?? attachment.imageUrl ?? attachment.assetUrl,
+      errorWidget: (context, url, error) {
+        return errorWidget;
       },
       fit: BoxFit.cover,
     );

pubspec.yaml

@@ -16,10 +16,10 @@ dependencies:
   url_launcher: ^5.4.2
   video_player: ^0.10.8+1
   chewie: ^0.9.10
-  file_picker: ^1.5.0
+  file_picker: ^1.5.1
-  image_picker: ^0.6.3+4
+  image_picker: ^0.6.4
   keyboard_visibility: ^0.5.6
-  stream_chat: ^0.1.19
+  stream_chat: ^0.1.21
   visibility_detector: ^0.1.4
 
 dev_dependencies: