Legal Question in Real Estate Law in California

The question is far too broad and general to be answered with a "yes or no" type reply. It would be helpful to know, for example, whether the inquiring party is the plaintiff or defendant; the nature of the hearing; who caused the hearing to be held; whether the error were oral or in a written pleading and the nature thereof; the overall timing and posture of the case; etc. etc. I can imagine situations where loss at a hearing would be fatal to a case, but also numerous scenarios where the consequences would be anywhere from merely serious to entirely trivial.