[ERROR] [launch]: Caught exception in launch: get_launch_arguments() missing 1 required positional argument: 'self'

edit

Hi, I'm just trying to work with ros2 launch file.. it runs well but i could not launch it, following error pops up :

[INFO] [launch]: Default logging verbosity is set to INFO
[ERROR] [launch]: Caught exception in launch (see debug for traceback): get_launch_arguments() missing 1 required positional argument: 'self'

find cpp:

int main(int argc, char * argv[])
{  
rclcpp::init(argc, argv);
auto node = rclcpp::Node::make_shared("test");
RCLCPP_INFO(node->get_logger(), "Hello!, Ros2 launch worked for me");
rclcpp::shutdown();
return 0;
}

mytext.launch.py file :

import launch
import launch.actions
import launch.substitutions
import launch_ros.actions

def generate_launch_description():
    return launch.LaunchDescription
    (
        [
        launch_ros.actions.Node
            (
            package='simple_test', 
            node_executable='my_test',
            output='screen'
            )
        ]
    )

Cmakelsit.txt:

cmake_minimum_required(VERSION 3.5)
project(simple_test)

if(NOT CMAKE_C_STANDARD)
  set(CMAKE_C_STANDARD 99)
endif()


if(NOT CMAKE_CXX_STANDARD)
  set(CMAKE_CXX_STANDARD 14)
endif()

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()


find_package(ament_cmake REQUIRED)
find_package(rclcpp REQUIRED)
find_package(std_msgs REQUIRED)

if(BUILD_TESTING)
  find_package(ament_lint_auto REQUIRED)
  ament_lint_auto_find_test_dependencies()
endif()


add_executable(my_test src/test.cpp)
ament_target_dependencies(my_test rclcpp std_msgs)

install(TARGETS
my_test
DESTINATION lib/${PROJECT_NAME}
)

install(DIRECTORY
  launch
  DESTINATION share/${PROJECT_NAME}/
) 

ament_package()