Error for new user sign up using wallet

We have some issue with new user signing up using wallet.
The following error has returned.

{code: 203, error: "Account already exists for this email address."}
code: 203
error: "Account already exists for this email address."

I would like to know what could possibly go wrong?

That is a generic error. It could happen if you deleted data from user table and not from ethAddress table. Or if you added some custom indexes to user table

Thanks. I think that’s the case.