Kenmore Elite Oasis washer does not lock

First, OL/UL stands for "Overload", so in other words, the washer things the tub is too hard to move because it's overloaded and the motor is struggling or the unit is way out of balance causing the washer to struggle. The most common problem is a nut below the inner tub that needs to "float". Floating is when the tub fills up with water to a certain level the inner basket will rise about 1 inch from the center agitator. What this does is disengage the basket from the motor so that the agitator can rotate independently from the basket. If the basket does not float then when it tries to agitate the whole basket will turn back and forth at the same speed as the agitator and this will cause the OL/UL error code.