addModifier function: Need some advice

Thanks very much! You are very kind.

You can't add the modifier because the name of the selected box is Box001, but you try to add modifier to Box01
So, to avoid this use:
addModifier $ ....
or
addModifier selection[1] ....
-- the code below will add bend modifier to selected object
(
bendM = Bend angle:45 direction:50
addModifier selection[1] bendM
)