Pearl Miles, manager of CB9, said she "made a mistake in the count," altering the results of the vote.
Principal Eric Havlik said class size will increase if the proposed District 15 rezoning isn't approved.
Members of a Crown Heights advocacy group were outraged when they weren't allowed to speak.
Residents angry that police barred them from entering the gathering began to chant in the lobby outside.
Parents say the proposed rezoning would force kids to travel too far to school on dangerous streets.
There are more than a dozen major construction projects underway or planned for the area.
The rezoning would affect P.S. 154, P.S. 130, P.S. 131 and P.S. 230.
The group Movement to Protect the People rallied outside CB9's headquarters Wednesday.
Critics of a plan to study rezoning on and near Empire Blvd. mistakenly thought the vote went their way.
Borough President Eric Adams shared his vision for rezoning Crown Heights at a community meeting Friday.
A Friday night forum on rezoning in Crown Heights was moved to 836 Franklin Ave.
The Friday evening forum excludes Jews observing Shabbat and weekend travelers, residents say.
The property is a portion of a larger lot bought for $7.5 million in 2008.
The plan would create 80,000 new units through mixed-income models and preserve 120,000 units.
A former auto parts warehouse will become a shared workspace for light manufacturers in Crown Heights.
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