Details

This message can be generated when the second argument in ToExpression is InputForm and the first argument is not a string.
Off[message] switches off the message; On[message] switches it on. For example: Off[General::notstr].

Examples

A RowBox expression is not valid InputForm input:

Wolfram Language code: ToExpression[RowBox[{"2", "+", "Pi"}], InputForm]

This shows a valid InputForm input:

Wolfram Language code: ToExpression["2 + Pi", InputForm]

A RowBox expression can be used for typeset input, such as input in StandardForm:

Wolfram Language code: ToExpression[RowBox[{"2", "+", "Pi"}], StandardForm]

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