Custom Node Definition Not loaded Error

Error in custom node definition not loaded kindly help to overcome this issues

@vivekanandanXVLYD ,

which revit do you use ?

look into the node, what is missing?

2024

This looks like a Rythm node. (Id say in your second example, someone has renamed the node)
image

You will need to install the Rythm package from the package manager.