Im having problem with topic publisher exercise 3.1

![error2|607x500]

<!-- My Package launch file -->

<node pkg="topic_publisher_pkg" type="simple_topic_publisher" name="topic_publisher"  output="screen">

</node>
this is my launch file i wanted to launch the exercise 3.1 but it keeps failing to launch. i think its launch file problem since i dont fully understand how to make a launch file. i need some corrections with my launch file and i want to know whats the error is about

i fixed it. i dont need an answer

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