Cannot launch node - turtlesim3 demo

[AutomationMartin]

Unfortunately the demos do not work for me.

My System
Ubuntu 20.04.6 LTS
ROS Noetic
cloned the repository today (30th Dec. 2023)

The error
Compiling works fine, but when starting the turtlesim demo node provided The following error occurs:
ERROR: cannot launch node of type [elevation_mapping/elevation_mapping]: Cannot locate node of type [elevation_mapping] in package [elevation_mapping]. Make sure file exists in package path and permission is set to executable (chmod +x)

Other information
The List of running ROS nodes are the following:
/gazebo /pcl_manager /rosout /rviz /voxel_grid /waffle_pose_publisher /waffle_state_publisher

rqt_graph:

RVIZ:

It is my first issue report, so if any infromation is missing i am sorry and will provide them as soon as you let me know what you need.