Details

This message is generated when the first element in the rule specification is a function, and the second element is not the empty list {}.
The rule specification is the first argument in CellularAutomaton. The color specification is the second element in the rule specification.
Off[message] switches off the message; On[message] switches it on. For example: Off[CellularAutomaton::nocol].

Examples

An error occurs in this example:

Wolfram Language code: CellularAutomaton[{Mod[#[[1]] + #[[3]], 2]&, None, 1}, {{1}, 0}, 5]

This shows a correct use of {} as a color specification when the rule is specified as a function:

Wolfram Language code: CellularAutomaton[{Mod[#[[1]] + #[[3]], 2]&, {}, 1}, {{1}, 0}, 5]

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