1 exception(s): Exception #0 (ReflectionException): Class Mageplaza\CustomerApproval\Model\Config\Source\AttributeOptions does not exist
This is most likely caused by removing the "Customer Approval" extension.
Looking at the source code of this extension it creates a customer entity attribute that implemented the mentioned class as a source model.
Check in database table
eav_attribute for the attribute
is_approved, and delete that row.