I have checked this problem all over, and with everyone else it seems it's simply a problem of them not having the class on both their KV and Python files, however, I'm still getting this error message with the class on both sides. This is a problem in multiple parts of my program, but the most recent one is this: raise FactoryException('Unknown class <%s>' % name) kivy.factory.FactoryException: Unknown class <ShowCurrentMeds> Here is my KV for this area: <ShowCurrentMeds>: name: 'ShowCurrentMeds' RecycleDataViewBahavior: # scroll layout of buttons # shows med And my python: class ShowCurrentMeds(RecycleDataViewBehavior): def currentmeds(self,meds): def edit(self, instance): EditMedPage.editmed_enter(temp[8]) ScreenManager.current = 'EditMedPage' dates = {1:'Jan', 2:'Feb', 3:'Mar', 4:'Apr', 5:'May', 6:'Jun', 7:'Jul', 8:'Aug', 9:'Sep', 10:'Oct', 11:'Nov', 12:'Dec'} meds = MedsPage.meds for med in range(len(meds[0])): temp = meds[0][med] currentmed = DropDown() # med name currentmed.add_widget(Label(text=temp[0])) if temp[1] is not None: # brand currentmed.add_widget(Label(text=temp[1])) if temp[2] is not None: # type of med currentmed.add_widget(Label(text=temp[2])) if temp[3] is not None: # explanation currentmed.add_widget(Label(text=temp[3])) # year if temp[4] is not None: # month if temp[5] is not None: # date if temp[6] is not None: currentmed.add_widget(Label(text='Started '+temp[6]+'/'+temp[5]+'/'+temp[4])) currentmed.add_widget(Label(text='Started '+dates.get(temp[5])+' '+temp[4])) currentmed.add_widget(Label(text= 'Started '+temp[4])) if temp[7] is not None: # end date currentmed.add_widget(Label(text='Ends '+temp[7])) thereisatime = False doselayout = GridLayout(cols=2) for time in range(len(meds[1])): temptime = meds[1][time] if temptime[0] == temp[0]: thereisatime = True doselayout.add_widget(Label(text=temptime[1])) # time doselayout.add_widget(Label(text=temptime[2])) # dose if thereisatime: currentmed.add_widget(doselayout) editbutton = Button(text='Edit') editbutton.bind(on_press=edit) currentmed.add_widget(editbutton) medbutton = Button(text=temp[1]) medbutton.bind(on_release=currentmed.open) which is called by class MedsPage(Screen): def med_enter(self): meds = json.loads(requests.get('http://CyanUnicorn26.eu.pythonanywhere.com/meds/current/main/', json={'SessionID':app.sessionID}).text) ShowCurrentMeds.currentmeds(meds) With the classes in both sides, I just don't see why that error is still coming up? Thanks in advance, I apologise in advance if it's just a silly error, I have a tendency for them, but considering it's happened with 4 classes-in-screens I think it's a problem with that? Continue reading...