[Python] Exception: ScrollView accept only one widget

I have been making a rather large app for a school project due soon, and for some reason it keeps coming up with this error. This didn't come up when I ran the same program on another laptop (which I no longer have access to). The DropDowns use ScrollView widgets.

The error messge when using debug is Exception: ScrollView accept only one widget pointing towards self.SM.add_widget(AppointmentsPage(name='AppointmentsPage'))

Here is my relevant .kv:

<SpoonieActionBar>:
id: SpoonieActionBar
MDFabBottomAppBarButton:
icon: 'calendar-clock'
on_press: root.parent.parent.manager.current = "AppointmentsPage"
MDFabBottomAppBarButton:
icon: 'pill'
on_press: root.parent.parent.manager.current = "MedsPage"
MDFabBottomAppBarButton:
icon: 'home-heart'
on_press: root.parent.parent.manager.current = "HomePage"
MDFabBottomAppBarButton:
icon: 'chart-line'
on_press: root.parent.parent.manager.current = "TrackersPage"
MDFabBottomAppBarButton:
icon: 'cog'
on_press: root.parent.parent.manager.current = "SettingsPage"

<ShowUpcomingAppointments>:
name: 'ShowUpcomingAppointments'
RecycleBoxLayout:
id: 'ShowUpcoming'
size_hint_y: None

<AppointmentsPage>:
name: 'AppointmentsPage'
on_pre_enter: root.appointments_enter()
BoxLayout:
orientation: 'vertical'
ShowUpcomingAppointments:
Button:
text: 'Add appointment'
on_press: root.manager.current = 'AddAppointmentPage'
Button:
text: 'Past Appointments'
on_press: root.manager.current = 'PastAppointmentsPage'
SpoonieActionBar:


Here is the relevant .py:

from kivy.uix.dropdown import ScrollView, DropDown
from kivy.config import Config
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.recycleview import RecycleView
from kivy.uix.actionbar import ActionBar
from kivymd.uix.appbar import MDTopAppBar, MDBottomAppBar, MDFabBottomAppBarButton
from kivymd.icon_definitions import md_icons
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivymd.app import MDApp
import requests
import json

class SpoonieTrackerApp(MDApp):
def __init__(self):
super().__init__()
self.sessionID = None
self.SM = None

def build(self):
self.load_kv("spoonietracker.kv")
self.theme_cls.theme_style_switch_animation = True
self.theme_cls.theme_style = 'Dark'
self.theme_cls.primary_palette = 'Indigo'

self.SM = ScreenManager()
# here are some more pages being added that are irrelevant
self.SM.add_widget(TrackersPage(name='TrackersPage'))
self.SM.add_widget(AppointmentsPage(name='AppointmentsPage'))
self.SM.add_widget(EditAppointmentPage(name='EditAppointmentPage'))


class ShowUpcomingAppointments(RecycleView):
def currentappointments(self, appointments):
def edit(self, instance):
EditAppointmentPage.editappt_enter(appointment[0])
app.SM.current = 'EditAppointmentPage'

for appointment in range(len(appointments)+1):
temp = appointments[appointment]
currentappt = DropDown(self)
layout = BoxLayout(orientation='vertical')
# datetime
layout.add_widget(Label(text=temp[0]))
# doctor
layout.add_widget(Label(text=temp[1]))
if temp[3] is not None:
# type
layout.add_widget(Label(text=temp[3]))
if temp[4] is not None:
# place
layout.add_widget(Label(text=temp[4]))
if temp[2] is not None:
# reason
layout.add_widget(Label(text=temp[2]))
if temp[5] is not None:
# notes
layout.add_widget(Label(text=temp[5]))

editbutton = Button(text='Edit')
editbutton.bind(on_press=edit)
layout.add_widget(editbutton)
final = BoxLayout(orientation='vertical')
final.add_widget(layout)
currentappt.add_widget(final)

apptbutton = Button(text=str(temp[0]+' with '+temp[1]))
apptbutton.bind(on_release=currentappt.open(self))
self.ids.ShowUpcoming.add_widget(apptbutton)

class AppointmentsPage(Screen):
def appointments_enter(self):
appointments = json.loads(requests.get('http://CyanUnicorn26.eu.pythonanywhere.com/appointments/current/',
json={'SessionID':json.dumps(app.sessionID)},allow_redirects=True))
ShowUpcomingAppointments.currentappointments(appointments)


the json returns a list of lists, so it's not that either.

I would really appreciate help with this, it must be something stupid I'm not seeing in the DropDown

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