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Mischa Barton has left one producer of her new movie Homecoming fuming after she cancelled her appearance at the film's New York premiere on Thursday (16Jul09) amid reports of a breakdown.

A Los Angeles Police Department spokesperson has confirmed the former The O.C. star called officials to her Hollywood home on Wednesday (15Jul09) for assistance with a medical issue.Reports suggest she was taken to a mystery location where she was placed under a 5150 hold - reserved for individuals who present a danger to themselves or others, are gravely disabled or suffer from a mental disorder - by the request of her physician.Mischa Barton subsequently pulled out of her planned red carpet appearance on Thursday, and while one producer, Austin Stark, has been sympathetic to the actress' troubles, his colleague Bingo Gubelmann admitted he was angry at the star's no-show.But he stopped short of slamming Mischa Barton, fearing his comments would hurt his production firm's reputation.He tells Usmagazine.com, It's frustrating. And it's not ideal. It's frustrating, but I'm not going to sit here and trash her because we're young as a company and we've got to live and learn... I don't want to be known as the producer that will turn on any actress at the drop of that hat.However, Gubelmann continued to vent his annoyance, claiming it's hard to remember why he cast Barton in the movie, because, you know, she's not here right now.He adds, Now, I haven't spoken to her yet because she's totally unreachable, so I don't know exactly what happened, (but) yes, it would obviously be nice if she was here (at the premiere). Even just to hang out.