Details

This message is generated when the first argument in CellularAutomaton is a list, and the third element in that list does not have the indicated form.
Off[message] switches off the message; On[message] switches it on. For example: Off[CellularAutomaton::rspec].

Examples

The third element in the first argument of CellularAutomaton cannot be an empty list:

Wolfram Language code: CellularAutomaton[{3, 2, {}}, {0, 1, 0}, 5]

This shows valid arguments in CellularAutomaton:

Wolfram Language code: CellularAutomaton[{3, 2, 1}, {0, 1, 0}, 5]

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