Coming to you question, it is best if you could upload your worksheet with some sample data. Could you please explain what are you trying to do with nested IF condition ? it looks like you are trying to return a value if you do not get a match from J3:J78 rows. if that is is the case why not change teh previous VLOOKUP call?
IFERROR() has an "else" part, i.e the 2nd argument , typically you should be able to achive the results with your condition in this part.