Kivymd on_release Button the action for next step with MDCard does not work - python-3.x

Question

I'm trying to make the button click on_release: app.proximo () have the action to go to the next card MDFloatLayout, but I'm not getting it, could someone help me how could it work?
Below the main.py file, where to start the app, main.kv file, where is the main app and finally the dashboard.kv file where I am calling my card inside the app
from kivymd.app import MDApp
from kivy.lang import Builder
from kivy.uix.screenmanager import Screen
class DashBoard(Screen):
pass
class FirstScreen(Screen):
pass
class Lavanderia(MDApp):
def build(self):
self.title="Texto Titulo"
self.theme_cls.primary_palette = "LightBlue"
return Builder.load_file("main.kv")
def proximo(self):
self.root.ids.carousel.load_next(mode="proximo")# Próximo Card
def fecharApp(self):
self.stop()# Fecha Aplicativo
Lavanderia().run()
#:import rgba kivy.utils.get_color_from_hex
#: include dashboard.kv
#: include firstscreen.kv
NavigationLayout:
id: nav_layout
ScreenManager:
Screen:
BoxLayout:
orientation:'vertical'
MDToolbar:
title: app.title
elevation:10
left_action_items:[["menu", lambda x: nav_drawer.set_state()]]
ScreenManager:
id: screen_manager
DashBoard:
id:dashboard
name:"dashboard"
FirstScreen:
id:first_screen
name:"first_screen"
MDNavigationDrawer:
id: nav_drawer
BoxLayout:
orientation:'vertical'
padding:"8dp"
spacing:"8dp"
Image:
pos_hint:{"x":.24,"y":.0}
size_hint: None, None
size:dp(146), dp(158)
source:"images/logo.png"
ScrollView:
MDList:
OneLineIconListItem:
text:"Tela 1"
on_release:
screen_manager.current = "dashboard"
nav_drawer.set_state()
IconLeftWidget:
icon:"dishwasher"
OneLineIconListItem:
text:"Tela 2"
on_release:
screen_manager.current = "first_screen"
nav_drawer.set_state()
IconLeftWidget:
icon:"dishwasher"
<DashBoard>:
MDFloatLayout:
MDCard:
size_hint: dp(.45), dp(.8)
pos_hint:{"center_x": .5, "center_y": .5}
Carousel:
id:carousel
MDFloatLayout:
MDTextField:
hint_text:"Texto 1"
size_hint_x:dp(.8)
pos_hint:{"center_x": .5, "center_y": .48}
MDRaisedButton:
text: "Proximo"
size_hint_x:dp(.8)
pos_hint:{"center_x":.5,"center_y":.2}
on_release: app.proximo() # Proximo step
MDFloatLayout:
MDLabel:
text:"Texto Final Conclusão"
theme_text_color:"Custom"
bold:True
pos_hint:{"center_x":.68,"center_y":.5}
font_style:"H5"
MDRaisedButton:
text: "Fechar Aplicativo"
text_color:rgba("#00FF69")
size_hint_x:dp(.8)
pos_hint:{"center_x":.5,"center_y":.4}
md_bg_color:rgba("#333333")
on_release: app.fecharApp() #fechar Aplicativo

Answer 1

You are trying to ger the carrousel through the root screen, but it is inside the dashboard screen.
So you will have to navigate there first, and only then you can call your function.
def proximo(self):
dashboard = self.root.ids.dashboard
carousel = dashboard.ids.carousel
carousel.load_next(mode="proximo")
# Same as
# self.root.ids.dashboard.ids.carousel.load_next(mode="proximo")