TableView not showing

TableView not showing

I have a very big FXML file that I designed on JavaFx SceneBuilder. When I
try adding a TableView now, the TableView only shows in the JavaFx
SceneBuilder and SceneBuilder's "Preview in Window", but not when I run
the project from netbeans.
Everything else in the scene shows perfectly.
Has anyone ever experienced this problem during development? How do I make
the TableView show when I run the project?
Thank you all in advance.