Fixing parsing issue in User model

lib/models/user.dart

@@ -81,7 +81,12 @@ class User {
     password = json['password'];
     token = json['token'];
     roles = json['roles'];
-    userRoles = json['userRoles'] as List<String>?;
+    if (json['userRoles'] != null) {
+      userRoles = <String>[];
+      json['userRoles'].forEach((v) {
+        userRoles!.add(v);
+      });
+    }
     tokenlife = json['tokenlife'];
     isAuthenticated = json['isAuthenticated'];
     hasError = json['hasError'];