Details

This message is generated when the second argument in Read, ReadList, or Skip is not a valid format specification.
Valid format specifications include Expression, String, Number, Real, Word, Record, Byte, Character, or a list of these specifications.
Off[message] switches off the message; On[message] switches it on. For example: Off[Read::readf].

Examples

Integer is not a valid format specification:

Wolfram Language code:

Module[{s = StringToStream["18 19 25"], result}, 
	result = ReadList[s, Integer];
	Close[s];
	result
	]

This shows a valid format specification in ReadList:

Wolfram Language code:

Module[{s = StringToStream["18 19 25"], result}, 
	result = ReadList[s, Number];
	Close[s];
	result
	]

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