python ScreenManager仅接受屏幕小部件的问题

我已经写了一个注册页面为我的应用程序.一切都很顺利，直到我更新与角色选项选择代码.我已经尝试调试，但问题仍然存在.
main.py `

# main.py
from kivy.core.text import LabelBase
from kivy.uix.screenmanager import ScreenManager, Screen
from kivymd.app import MDApp
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.factory import Factory
from kivy.uix.button import Button
import requests

Window.size = (310, 580)

class NavBarScreen(Screen):
    pass

class HomeScreen(Screen):
    pass

class SignUpScreen(Screen):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.dropdown = DropDown()
        self.role_button = Button(text='Select Role', size_hint=(None, None), height=44)
        self.role_button.bind(on_release=self.dropdown.open)
        self.dropdown.bind(on_select=lambda instance, x: setattr(self.role_button, 'text', x))
        self.add_widget(self.role_button)

        for role in ["Farmer", "Administrator"]:
            btn = Button(text=role, size_hint_y=None, height=44)
            btn.bind(on_release=lambda btn: self.dropdown.select(btn.text))
            self.dropdown.add_widget(btn)

    def signup_request(self, username, password, role):
        signup_data = {"username": username, "password": password, "role": role}
        api_url = "https://c272-2001-d08-d2-d387-2cd9-bbf2-5f29-cacf.ngrok-free.app/signup"
        response = requests.post(api_url, json=signup_data)

        if response.status_code == 200:
            print("Successfully signed up! Token: ", response.json()["access_token"])
        else:
            print("Signup failed. Error: ", response.json()["detail"])

class Myapp(MDApp):
    def build(self):
        screen_manager = ScreenManager()
        screen_manager.add_widget(Builder.load_file("start.kv"))
        screen_manager.add_widget(Builder.load_file("signup.kv"))
        screen_manager.add_widget(Builder.load_file("login.kv"))
        home_screen = HomeScreen(name="home")
        home_screen.add_widget(NavBarScreen())

        screen_manager.add_widget(home_screen)
        return screen_manager

    def show_role_dropdown(self, text_field):
        text_field.focus = False
        self.screen.ids.role_dropdown.open()

    def select_role(self, role):
        self.screen.ids.role_input.text = role
        self.screen.ids.role_dropdown.dismiss()

    def change_color(self, instance):
        if instance in self.root.ids.values():
            current_id = list(self.root.ids.keys())[list(self.root.ids.values()).index(instance)]
            for i in range(4):
                if f"nav_icon{i}" == current_id:
                    self.root.ids[f"nav_icon{i + 1}"].text_color = 1, 0, 0, 1
                else:
                    self.root.ids[f"nav_icon{i + 1}"].text_color = 0, 0, 0, 1

    def goto_home_screen(self):
        self.root.current = "home"

if __name__ == "__main__":
    LabelBase.register(name="Poppins-Medium", fn_regular=r"C:\Users\User\Desktop\FONT\Poppins\Poppins-Medium.ttf")
    LabelBase.register(name="Poppins-SemiBold", fn_regular=r"C:\Users\User\Desktop\FONT\Poppins\Poppins-SemiBold.ttf")

    Factory.register("NavBarScreen", cls=NavBarScreen)

    # Create an instance of Myapp and run it
    app = Myapp()
    app.run()

字符串
signup.kv

# signup.kv
<SignUpScreen>:
    name: "signup"
    MDScreen:
        MDFloatLayout:
            md_bg_color: rgba(246, 250, 247, 255)
            Image:
                source: r"C:\Users\User\Desktop\FONT\Pytho2farmers.zip"
                pos_hint: {"center_x": 0.75, "center_y": .15}

            MDIconButton:
                icon: "arrow-left"
                pos_hint: {"center_y": .95}
                user_font_size: "30sp"
                theme_text_color: "Custom"
                text_color: rgba(26, 24, 58, 255)
                on_release:
                    root.manager.transition.direction = "right"
                    root.manager.current = "main"

            MDLabel:
                text: "Hi!"
                font_name: "Poppins-SemiBold"
                font_size: "26sp"
                pos_hint: {"center_x": .6,"center_y": .85}
                color: rgba(48, 62, 39, 255)

            MDLabel:
                text: "Create an account"
                font_name: "Poppins-SemiBold"
                font_size: "18sp"
                pos_hint: {"center_x": .6, "center_y": .79}
                color: rgba(180, 187, 114, 255)

            MDFloatLayout:
                size_hint: .7, .07
                pos_hint: {"center_x":.5, "center_y":.71}
                TextInput:
                    hint_text: "Username"
                    font_name: "Poppins-Medium"
                    size_hint_y: .75
                    pos_hint: {"center_x":.5, "center_y":.5}
                    background_color: 1, 1, 1, 0
                    foreground_color: rgba(0, 0, 59, 255)
                    cursor_color: rgba(0, 0, 59, 255)
                    font_size: "14sp"
                    cursor_width: "2sp"
                    multiline: False

                MDFloatLayout:
                    pos_hint: {"center_x": .5, "center_y": 0}
                    size_hint_y: .03
                    md_bg_color: rgba(178, 178, 178, 255)

            MDFloatLayout:
                size_hint: .7, .07
                pos_hint: {"center_x":.5, "center_y":.6}
                TextInput:
                    hint_text: "Password"
                    font_name: "Poppins-Medium"
                    size_hint_y: .75
                    pos_hint: {"center_x":.5, "center_y":.5}
                    background_color: 1, 1, 1, 0
                    foreground_color: rgba(0, 0, 59, 255)
                    cursor_color: rgba(0, 0, 59, 255)
                    font_size: "14sp"
                    cursor_width: "2sp"
                    multiline: False

                MDFloatLayout:
                    pos_hint: {"center_x": .5, "center_y": 0}
                    size_hint_y: .03
                    md_bg_color: rgba(178, 178, 178, 255)

            MDFloatLayout:
                size_hint: .7, .07
                pos_hint: {"center_x":.5, "center_y":.6}
                MDTextField:
                    id: role_input  # Add this ID
                    hint_text: "Role"
                    font_name: "Poppins-Medium"
                    size_hint_y: .75
                    pos_hint: {"center_x": .5, "center_y": .5}
                    background_color: 1, 1, 1, 0
                    foreground_color: rgba(0, 0, 59, 255)
                    cursor_color: rgba(0, 0, 59, 255)
                    font_size: "14sp"
                    cursor_width: "2sp"
                    multiline: False
                    readonly: True
                    on_focus: if self.focus: app.show_role_dropdown(self)

                MDRaisedButton:
                    id: role_dropdown_btn
                    pos_hint: {'center_x': .5, 'center_y': .6}
                    text: "Choose Role"
                    on_release: app.show_role_dropdown(role_input)

            MDRaisedButton:
                text: "SIGNUP"
                size_hint: .66, .065
                pos_hint: {"center_x": .5, "center_y":.33}
                background_color: 0, 0, 0, 0
                font_name: "Poppins-SemiBold"
                on_release:
                    root.signup_request(username_input.text, password_input.text, role_input.text)

型
我希望整个事情可以运行，但它不能。我尝试了调试和它所显示的是

'ScreenManager accepts only Screen widget.')

型
并且还

(<class 'kivy.uix.screenmanager.ScreenManagerException'>, ScreenManagerException('ScreenManager accepts only Screen widget.'), <traceback object at 0x000001548362E048>)

型
和

File "C:\Users\User\PycharmProjects\Assignment\main.py", line 47, in build
     screen_manager.add_widget(Builder.load_file("signup.kv"))
   File "C:\Users\User\PycharmProjects\Assignment\.venv\lib\site-packages\kivy\uix\screenmanager.py", line 988, in add_widget
     'ScreenManager accepts only Screen widget.')
 kivy.uix.screenmanager.ScreenManagerException: ScreenManager accepts only Screen widget.

型
我已经不知道了。我已经检查了类似的问题的解决方案，但问题仍然存在。你是我解决这个问题的最后希望。

python ScreenManager仅接受屏幕小部件的问题

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