Thanks for the reply.
To begin with, I didn't know that I had to define the application as B4XPages for this type of application. I took "UI" option as User interface. My mistake.
Log returns response : javafx.scene.control.TableView
I noticed on your TableView Tutorial post that I have to insert #Region Helper Methods procedures and the javaObject library, but the error remains. At the same time, I noticed that in your case you are not using the jXUI library.
If I remove the jXUI library, the "tbl_LoadData.SetColumns" error disappears, but then I can't access the objects on the other form. When declaring "Private tbl_LoadData As B4XView" I get the error "Unknown type B4Xview. Are you missing library reference" .
Since everything is difficult to describe, I am attaching the application for review. I'm doing something wrong but I don't know what
.