There seems to be conflicting dependencies in requirements.txt, as is shown in the pic.
For now I removed the restriction for networkx (line 63), but I just want to check if it’s the right thing to do.
Hi, enter-port.
Thank you for bringing this issue to our attention. The root of the problem appears to be that the maintenance of urdfpy has ceased, potentially leading to compatibility issues with newer versions of numpy. If you encounter this problem, you could try removing the version restriction for networkx and then upgrading networkx to version 2.8 manually, ignoring the dependency warning.
Got it. 
Many thanks!