Hello toyinal
Thank you for your answer.
Let's proceed this way:
Could you please try to delete the User Field with ID 200000003 ?
You can get the field ID this way:
Go to menu Users > User Fields, then pick "General Info". Then click on the fields in the list:
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As you can see in the URL bar of your browser, the URL ends with the field ID, on the screenshot it is id=200000013
.
When you have spotted the field with ID 200000003, click "Delete".