Questions & Answers about Greška je sada ispravljena.
- greška = mistake, error
- je = is
- sada = now
- ispravljena = corrected
So the sentence literally looks like Mistake is now corrected, but in natural English it is usually The mistake has now been corrected or The mistake is now corrected.
This is a passive construction.
- je is the present tense of biti = to be
- ispravljena is the passive participle of ispraviti = to correct
Together they mean something like is corrected / has been corrected, depending on context.
So:
- Greška je ispravljena = The mistake is corrected / has been corrected
Croatian often builds the passive this way:
biti + passive participle