ISERROR function
ISERROR tests if the cells contain general error values. ISERROR recognizes the #N/A error value. If the cell being referenced contains any error such as #N/A, #DIV/0 or #Err 522, it returns TRUE.
Syntax
ISERROR(value)
value is any value where a test is performed to determine whether it is an error value.
Example
=ISERROR(C8) returns FALSE.