The format string wired to a Format Into File, Format Into String, Scan From File, or Scan From String function contains a format specifier (% code) that does not match the type of its corresponding argument.
For example, in the following illustration, the format string specifies formatting the first argument as a fractional number, the second argument as a decimal integer, and the third as a fractional number. However, the second argument is a string, and LabVIEW cannot convert it into a numeric input.
To correct this error, right-click the Format or Scan function and select Edit Format String or Edit Scan String from the shortcut menu. The Edit Format String or Edit Scan String dialog box appears. Use this dialog box to edit the string.