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The formula “X1” specified in the error message - Expression #1 in the below example – is operating on an existing numeric field, whereas the components of the expression ([Y1] and [Y2]) are string fields. This error also applies to newly created numeric output columns.
String fields often contain numbers that are stored as strings, such as revenue in a .csv file. If the expression was intentional, the function ToNumber() will convert the string to a numeric type for use in the formula. This will not change any of the data types downstream of the Formula tool.