Details

This message is generated when syntax that does not correspond to a number is encountered while reading Number format from the indicated stream.
Off[message] switches off the message; On[message] switches it on. For example: Off[Read::readn].

Examples

The characters read from the stream are not valid in Number format:

Wolfram Language code:

Module[{s = StringToStream["{1.7, 3.5, 2.2}"], result}, 
	result = ReadList[s, Number];
	Close[s];
	result
	]

This stream can be read in Expression format:

Wolfram Language code:

Module[{s = StringToStream["{1.7, 3.5, 2.2}"], result}, 
	result = ReadList[s, Expression];
	Close[s];
	result
	]

The commas in the input stream are not valid in Number format:

Wolfram Language code:

Module[{s = StringToStream["1.7, 2.4, 3.5"], result}, 
	result = ReadList[s, Number];
	Close[s];
	result
	]

The data in this example can be read in Word format and converted to numbers using ToExpression:

Wolfram Language code:

Module[{s = StringToStream["1.7, 2.4, 3.5"], result}, 
	result = ReadList[s, Word, WordSeparators -> ","];
	Close[s];
	ToExpression /@ result
	]

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