TRUE
ISERR(Scratch.X1)
The ISERR function returns TRUE if an argument references an error value, such as #VALUE!. For example, this returns TRUE because the #VALUE! error is recognized by the ISERR function.
ISERR(Scratch.A1)
The ISERR function does not recognize all errors. For example, this returns FALSE because the #N/A! error is not recognized by the ISERR function.
The ISERR function is used in formulas that refer to the value of another cell. It checks for errors and returns a logical value of TRUE or FALSE depending on the result.