helloworld.py error

[tturkmen]

Thanks for your works
Hello I have crazyflie 2.1 with flow deck, connect from crazyradio Pa
I installed physcial and robot simulations but when run helloworld.py with roslaunch, have srv error. How can solve this problem.

[whoenig]

You need to source your ROS workspace in the second terminal as well.

[tturkmen]

When I run pytest

Then source and run helloworld.py with source

I source like photo but problem not solved yet.
But only run sim mode no problem.

[whoenig]

Perhaps you pulled the latest Crazyswarm changes, but did not rebuilt using build.sh? This sounds like the ROS package is not properly built.

[tturkmen]

Yes I pulled changes and use build.sh. But I was ubuntu 18.04. Now I use ubuntu 20.04 and problem solved. Thanks..