Error (law)
Encyclopedia
There are many kinds of error in law. Reversible error
Reversible error
In law, a reversible error is an error by the trier of law or the trier of fact or malfeasance by one of the trying attorneys which results in an unfair trial...

 can lead to a judgment being overturned on appeal. Harmless error
Harmless error
A harmless error is a ruling by a trial judge that, although mistaken, does not meet the burden for a losing party to reverse the original decision of the trier of fact on appeal, or to warrant a new trial. Harmless error is easiest to understand in an evidentiary context...

 is distinguished from plain error in that if error is preserved by the making of a timely objection
Objection (law)
In the law of the United States of America, an objection is a formal protest raised in court during a trial to disallow a witness's testimony or other evidence which would be in violation of the rules of evidence or other procedural law...

, the burden of proof is on the appellee to show that the error was harmless, but if error was not preserved, the burden of proof is on the appellant to show that the error was plain.
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