Details

This message is generated when the iteration specification has four elements and the fourth element is zero or is not a number.
Off[message] switches off the message; On[message] switches it on. For example: Off[NProduct::npst].

Examples

The symbolic parameter in the iteration specification does not have a numerical value:

Wolfram Language code: NProduct[1 / k ^ 2, {k, 1, 4, step}]

This shows a valid iteration specification in NProduct:

Wolfram Language code: With[{step = 0.5}, NProduct[1 / k ^ 2, {k, 1, 4, step}]]

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