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For using Groot I have used this tutorial:

• https://navigation.ros.org/tutorials/docs/using_groot.html

And these steps for the ROS2 Galactic installation:

   cd ~/dev_ws/src
   git clone https://github.com/BehaviorTree/Groot.git
   cd ..
   rosdep install --from-paths src --ignore-src
   colcon build --symlink-install --packages-select groot

I have sudo apt install ros-galactic-behaviortree-cpp-v3 before too.

You have to source install/setup.bash and then ./build/groot/Groot.

Can you check your installation with these steps? I installed it this way on ROS2 Galactic without errors (there were some warnings though). Maybe you missed some dependency?