I get the following error message:
error: graph: empty bounds rectangle

What does it mean and how can I fix it?
Thanks a lot,
yMotion

OK, just found out that "bounds rectangle" are the X-range and Y-range of a table (right-click an array/Properties). so a message like that:
[; array10 bounds 0 -5 10 5(
means:
X range from 0 to 10, Y range from -5 to 5