General::npad
The value of the NumberPadding option is an integer rather than a string:
PaddedForm[Column[{37.58, 1.03, 0.00581}], {8, 5}, NumberPadding -> 0]This shows a valid value for the NumberPadding option:
PaddedForm[Column[{37.58, 1.03, 0.00581}], {8, 5}, NumberPadding -> "0"]