Rivers State Governor Nyesom Wike was unable to vote due to a problem with the BVAS machine at his polling unit, which checks voter cards.
Electoral officials recommended that he should return later since they had invited their technical team to verify the device.
The governor was joined by his wife, Judge Eberechi Suzzette Nyesom-Wike, at the polling unit in ward 7, unit 9 Rumuepirikom, Obio Akpor local government area, to vote.
He was disappointed that the BVAS system, which uses facial and fingerprint technology, had not worked properly.