Misleading error message when trying to signup with existing user

[Atihinen]

I completely had forgotten that I've already registered to service.

When trying to do new account with existing email I got this error: Ops, it seems that this email is not allowed

When I was expecting to see something else like Credentials don't match, forgot the password?

Steps to produce:

• Create account
• Create new account with previous account email
• See the error message: Ops, it seems that this email is not allowed