Hey guys, I have a question that should theoretically be simple, but I do not know how to do it. Basically I'm doing a simple app where you can create tasks and add to a list, I wanted to make a screen to show the tasks created and one to create the tasks (for now I only managed to do both on a screen), only then the problem arises, screens are classes, so when I'm going to call my method of creating the task on the specified screen, it gives error because this method of creating does not belong to that class.

How would I refer to this method from another class, if it is not possible which is the best solution?

class Tarefas(Screen):
    def __init__(self,tarefas = [], **kwargs):
        super().__init__(**kwargs)
        for tarefa in tarefas:
            self.ids.box1.add_widget(Tarefa(text=tarefa))
    def addWidget(self):
        texto = self.ids.texto.text
        nome = self.ids.nameinput.text
        self.ids.box1.add_widget(Tarefa(text = texto, name = nome))
        self.ids.texto.text = ''
    self.ids.nameinput.text = ''

class Tarefa(GridLayout):
    def __init__(self, name, text='', **kwargs):
        super().__init__(**kwargs)
        self.ids.label1.text = text
        self.ids.label2.text = name

KV file

<Tarefas>:
    GridLayout:
        canvas:
            Color:
                rgba:1,1,1,1
            Rectangle:
            size:self.size
            pos:self.pos
        rows:2
        ScrollView:
             BoxLayout:
             orientation:'vertical'
             id:box1
             height:self.minimum_height
             size_hint_y: None
    BoxLayout:
        Botao:
            text:' Criar tarefa'
            on_press: app.root.current =  'criar'


<Tarefa>:
    canvas:
        Color:
            rgba:0.1,0.5,0.7,1
        Rectangle:
            size: self.size
            pos: self.pos
    rows:2
    cols:3
    size_hint_y:None
    height:100
    Label:
        id:label2
        font_size:20
    Label:
        id:label1
        font_size:20
    Botao:
        text:'√¯'
        font_size: 40
        size_hint_x: None
        size_hint_y: None
        height:30
        width: 30

        on_press:app.root.get_screen('tarefas').ids.box1.remove_widget(root)

<Criar>:
    BoxLayout:
        orientation:'vertical'
        Label:
            text:'Tarefa'
            size_hint: None, None
            width:50
            color: 0,0,0,1
            height:60
        TextInput:
            id:nameinput
            height:30
            size_hint_y:None
            height: 60
        Label:
            text:'Horário'
            size_hint: None, None
            width:50
            color: 0,0,0,1
            height:60
        TextInput:
            id:texto
            height:30
            size_hint_y: None
            height:60
        Botao:
           text:'Criar'
           on_press: root.addWidget()

The code should be messy, but I make it clear that I'm a beginner, I've pasted everything but the method is in the last line.

Thank you in advance.