error: ‘options’ does not name a type

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Hello,

I am using ROS 2 Galactic on Ubuntu 20.04. I am trying to create a callback group using the tutorial on ROS2 documentation. I am getting this error

error: ‘options’ does not name a type

This is how I am defining my group:

rclcpp::CallbackGroup::SharedPtr my_callback_group = create_callback_group(rclcpp::CallbackGroupType::Reentrant);
rclcpp::SubscriptionOptions options;
options.callback_group = my_callback_group;

I have also tried:

auto my_callback_group = create_callback_group(rclcpp::CallbackGroupType::Reentrant);
rclcpp::SubscriptionOptions options;
options.callback_group = my_callback_group;

I still get the same error. Thanks.