[Bug] Error in yaml file for planner server

[soren.rusbjerg]

This is an error report.

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Screenshot of the error

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Error details

There is an error in the planner yaml file for the exercise. The grid based planner tag is duplicated which makes he robot use the default planner rather than the straight line planner. ``` GridBased: plugin: "nav2_navfn_planner/NavfnPlanner" ```

[albertoezquerro]

Hello @soren.rusbjerg ,

This has been fixed, many thanks for the feedback!