This error message popups when I tried to insert global variable. But in YouTube video it works. When I give other than X value it works. What is the reason for that?
As suspected, you've features names with X, Y and Z and hence the issue (which is correct behavior). I changed the axis names for X and Y to show you that it works.
Works OK for me, so check and make sure that there is no property with name as x under custom or configuration properties.
Part file is attached. It is x and y gives trouble.
Thanks for identifying the issue.
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