HI,
As suggested by Mahadeo Kedari do the changes in hight of main table so that it will not display blank row(e.g each row take 0.5 mm row height to print properly for small font less that 0.5 mm )
Please check in footer weather u set any condition or not, some time due to condition footer failed to
print.
Note-Please attach image of smart form output if error not resolved.
Hope this will help u