Unable to launch gazebo simulation in rosject

I keep getting this error whenever I try to launch the gazebo simulation at the real robotlab. It used to work before but I have no idea why its no longer working.
Please how can I fix it?

Hi @abdulbasityekeen61 ,

Seems like you didn’t have sourced the workspace in the first place. It should not happen, btw.

Could you try
source ~/catkin_ws/devel/setup.bash
before launching the simulation?

You can also share your rosject with me, so I can check it better

I tried the error still persists

Could you share the link of your rosject?
It could be the files are really missing, for some reason