I'have checked B4XTable in the library, but in the sub globals, my variables which are B4XT as B4Xtable and col(30) as B4XTableColumn remain red. The app doesn't recognize them !!!
He probably has a B4XPages project but has also added another Activity, in addition to the Main (this is strongly inadvisable, unless you need an Activity with a different orientation than the Main).
Try cleaning the project (from the menu or CTRL+P).
Also see if you have any other errors elsewhere.