Details

This message is generated when SetSystemOptions is used with an option name that is not a known system option.
Known system options can be listed by evaluating SystemOptions[].
Off[message] switches off the message; On[message] switches it on. For example: Off[General::sysname].

Examples

The name given in the argument of SetSystemOptions is not a known system option:

Wolfram Language code: SetSystemOptions["PackedArrayOptions" -> {"UnpackMessageFlat" -> True}]

This sets a system option that enables certain diagnostic messages:

Wolfram Language code: SetSystemOptions["PackedArrayOptions" -> {"UnpackMessage" -> True}]

Wolfram Language code: Block[{expr = Range[5]}, expr + Null]

Turn this system option off:

Wolfram Language code: SetSystemOptions["PackedArrayOptions" -> {"UnpackMessage" -> False}]

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