[FIX] Error Stream in constructor.

lib/src/form/src/controller.dart

@@ -7,6 +7,10 @@ import './models/models.exports.dart';
 /// Manages a registry of reactive [AstromicFieldNode]s, handles dynamic group creation via UUIDs,
 /// and provides a robust validation mechanism covering both visible and hidden fields.
 class AstromicFormController {
+  AstromicFormController({
+    this.errorStream,
+  });
+
   /// The global key attached to the [Form] widget for integrated Flutter validation.
   final GlobalKey<FormState> key = GlobalKey<FormState>();
 
@@ -20,10 +24,10 @@ class AstromicFormController {
   /// Accessor for the map of group definitions currently registered in the controller.
   Map<String, AstromicFormGroupDefinition> get groupDefs => _groupDefs;
 
-  final StreamController<List<(String code, String? message)>> _errorStreamController = StreamController.broadcast();
+  // final StreamController<List<(String code, String? message)>> _errorStreamController = StreamController.broadcast();
 
   /// A stream that emits a list of error codes and messages for external handling.
-  Stream<List<(String code, String? message)>> get errorStream => _errorStreamController.stream;
+  final Stream<List<(String code, String? message)>>? errorStream;
 
   /// Registers a [AstromicFormGroupDefinition] to the controller to enable dynamic instance handling.
   void registerGroup(AstromicFormGroupDefinition def) {
@@ -67,7 +71,7 @@ class AstromicFormController {
       return newNode;
     }
 
-    throw Exception("Node $id not found and cannot be lazy-inited for type $T. Provide an initialValue.");
+    throw Exception('Node $id not found and cannot be lazy-inited for type $T. Provide an initialValue.');
   }
 
   Type _typeOf<T>() => T;
@@ -130,7 +134,7 @@ class AstromicFormController {
   /// Adds a new instance to a dynamic group, generating a UUID and initializing all schema fields.
   String addGroupInstance(String groupId, {String? parentUuid, Map<String, dynamic>? initialData}) {
     final def = _groupDefs[groupId];
-    if (def == null) throw Exception("Group $groupId not registered.");
+    if (def == null) throw Exception('Group $groupId not registered.');
 
     final newUuid = DateTime.now().microsecondsSinceEpoch.toString();
 
@@ -228,6 +232,5 @@ class AstromicFormController {
       if (n is AstromicFieldNode) n.disposeUI();
       n.dispose();
     }
-    _errorStreamController.close();
   }
 }

lib/src/form/src/widgets/string_form_field.dart

@@ -79,7 +79,9 @@ class _AstromicStringFormFieldState extends State<AstromicStringFormField> {
       }
     }
 
-    widget.formController.errorStream.listen(_handleApiErrors);
+    if (widget.formController.errorStream != null) {
+      widget.formController.errorStream!.listen(_handleApiErrors);
+    }
   }
 
   @override