Resolved - M2: user creation fails with "class does not exit"

Question

Magento 2 site, that had data transferred from a Magento 1.9 site.

When attempting to create a user, it fails with:

Class Magento\Eav\Model\Attribute\Data\Datetime does not exist

There are no entries that look like that in the eav_attribute table.

Is it looking for an eav_attribute in that table that isn't there? or is there an entry in another eav table that is making it look for a class somewhere?

Solution:

The migration had brought over some customer eav attributes from a HORRIBLE module (FME Booking and Reservation). It was probably my fault for not mapping things correctly, however the solution was to delete the entries from the table customer_eav_attribute.

Answer 1

Hmmm..., You're config class-map incorrectly when migrate Magento 1 to Magento 2. You should be checked this attribute_code in Magento 1 and change it to:

    <rename>
        <from>eav/entity_attribute_backend_datetime</from>
        <to>Magento\Eav\Model\Entity\Attribute\Backend\Datetime</to>
    </rename>
    <!-- OR -->
    <rename>
        <from>eav/entity_attribute_frontend_datetime</from>
        <to>Magento\Eav\Model\Entity\Attribute\Frontend\Datetime</to>
    </rename>