Form submit issue

Hi,

I have created a form. When I click on submit, I have an error page, and the error description is:

RuntimeException
A user account already exists, please create an admin account manually.

I have configured the email plugin and try with Sendmail and SMTP Mail Engine.
The form is:

title: ‘Richiedi Assistenza’
fontawesome: use_global
animate_css: use_global
wow_js: use_global
google_prettify: use_global
foundation_abide_js: use_global
foundation_accordion_js: use_global
foundation_accordionMenu_js: use_global
foundation_drilldown_js: use_global
foundation_dropdown_js: use_global
foundation_dropdownMenu_js: use_global
foundation_equalizer_js: use_global
foundation_interchange_js: use_global
foundation_magellan_js: use_global
foundation_offcanvas_js: use_global
foundation_orbit_js: use_global
foundation_responsiveMenu_js: use_global
foundation_responsiveToggle_js: use_global
foundation_reveal_js: use_global
foundation_slider_js: use_global
foundation_sticky_js: use_global
foundation_tabs_js: use_global
foundation_toggler_js: use_global
foundation_tooltip_js: use_global
foundation_util_box_js: use_global
foundation_util_keyboard_js: use_global
foundation_util_mediaQuery_js: use_global
foundation_util_motion_js: use_global
foundation_util_nest_js: use_global
foundation_util_timerAndImageLoader_js: use_global
foundation_util_touch_js: use_global
foundation_util_triggers_js: use_global
form:
name: contact
fields:
-
name: nominativo
label: Nominativo
placeholder: ‘Inserisci il tuo nominativo’
autocomplete: ‘on’
type: text
validate:
required: false
-
name: modello
label: Modello
placeholder: ‘Inserisci il modello’
autocomplete: ‘on’
type: text
validate:
required: false
-
name: Indirizzo
label: Indirizzo
placeholder: ‘Inserisci indirizzo’
autocomplete: ‘on’
type: text
validate:
required: false
-
name: citta
label: Città
placeholder: ‘Inserisci la città’
autocomplete: ‘on’
type: text
validate:
required: false
-
name: telefono
label: Telefono
placeholder: ‘Inserisci recapito telefonico’
autocomplete: ‘on’
type: text
validate:
required: false
-
name: email
label: Email
placeholder: ‘Indirizzo email’
type: email
validate:
required: false
-
name: descrizione
label: ‘Descrizione del problema’
placeholder: ‘Inserisci descrizione del problema’
type: textarea
validate:
required: false
buttons:
-
type: submit
value: Invia
-
type: reset
value: Pulisci
process:
-
-
email:
to:
- ‘{{ config.plugins.email.to }}’
- ‘{{ form.value.email }}’
subject: ‘[Feedback] {{ form.value.nominativo|e }}’
body: ‘{% include ‘‘forms/data.html.twig’’ %}’
-
save:
fileprefix: contact-
dateformat: Ymd-His-u
extension: txt
body: ‘{% include ‘‘forms/data.txt.twig’’ %}’
-
message: ‘Grazie per averci contattato!’
-
display: thankyou

Thanks and regards.
Angelo