The OB error code indicates the motor getting out of balance due to improperly distributed load. In most cases, it is an occasional issue.
To correct it, open the lid and load the machine properly. After that, close the lid and let the washer continue the cycle. If you have redistributed the load well, the error will disappear.
The imbalance can also appear is the washer is not leveled well, or you have loaded few items. If you have recently tilted the machine to drain the pump, one of the shocks could have gotten misplaced.