I am following the tutorials and I Can move the turtle on the turtlesim. But I noticed that using move2goal(X, Y, tolerance) didn't work well. So I found that the /turtle1/pose is not returning data. And I ran rostopic echo /turtle1/pose and bingo! There is not data either printed on the terminal. So for some reason the turtlesim/Pose or /turtle1/pose is not working.

Any idea why I can't get messages from this topic ?

I am running : 18.04.1-Ubuntu ROS: Melodic

LOG PICTURE(I can't update images here yet): https://prnt.sc/v1w718

Thank you guys!

Thanks!