I have download a book called How Dynamo Can Help Revit With Its Topographical
Issues by Mr.Jostein Olsen. However, when I use the example of Cut-Objects, and other examples , it all has this problem.
Please help me about this. Thank you
Please show the full graph. Also @jostein_olsen
And I follow the instruction from this video https://www.youtube.com/watch?v=xoG17JZVpNs.
However, when I run, this happened
Can you take the screenshot with more zoom and re-upload the graph? Now it is not showing titles over the nodes and it is hard to guess what they are. Thanks
In FIle> Export Workspace as Image you can do it quickly and with good resolution
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Here it is. Thank you for you recommendation
I’m a newbie so I cannot upload the file.
Please take a look at it and give me some feedback.
Try to feed the mesh.topolysurface node with a true value to the mergeAll input.
Could you show me how to do that, please!! Thank you.
Nope, take pride in trying to solve things yourself! 
While I’m more than happy answering questions on this forum, you must also show that your willing to put in at least some effort. Please have a look at boolean values in the
primer (https://primer.dynamobim.org/en/04_The-Building-Blocks-of-Programs/4-3_logic.html )
and try to apply it yourself. Come back here if the script is still erroneous.
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