You can say "error grande", or "equivocación grande".
Error is the same in Eng. and Span.its pronounces eh-ROR.
grande is big in Spanish. pronounciation (grondeh)
Desastre afortunado. Error afortunado.
grande
grande
Grande.
The big party would be "El fiesta grande" in Spanish.
Gran familia is the best way to say "big family" in Spanish.
englesh to spanish
Una familia grande is "one big family" in Spanish.
Grande
Grande