В чем ошибка в Checkbox

Как добавить gorizontal и vertical layoutimport sys, time, math, requests, subprocess,threading,traceback
from ast import literal_eval
from kivy.app import App
from kivy.uix.checkbox import CheckBox
from kivy.uix.label import Label
from  kivy.uix.gridlayout import GridLayout
from kivy.core.window import Window
 
 
Window.clearcolor = (2/255, 187/255, 100/255, 100)
Window.title = "Категории"
 
class checkbclass(App):
    def build(self):
        bdfile = open('category.txt', encoding='ANSI')
        self.t = []
        self.checkboxses = {}
        self.cot = bdfile.read()
        self.arriwwe = self.cot.splitlines()
        self.arriwechoose = literal_eval(self.arriwwe[0])
        self.arriwecotegory = self.arriwwe[-1:]
        if self.arriwechoose[2] == True or self.arriwechoose == False:
 
            self.choose = self.arriwechoose[-3:]
        elif self.arriwechoose[1] == True or self.arriwechoose == False:
            self.choose = self.arriwechoose[-2:]
        else:
            self.choose = self.arriwechoose
        self.gridlay = GridLayout(cols=2)
        for i in self.arriwecotegory:
            self.chosedcheckbox = i
            self.checkboxsnames = Label()
            self.checkboxs = CheckBox()
            self.checkboxsnames.text = i
            self.checkboxs.bind(active=self.checkboxsfunc)
            for ii in self.choose:
                if ii == i:
                    self.checkboxs.value(True)
            self.checkboxses[self.checkboxs]=[self.checkboxsnames,i]
        for i in self.checkboxses.keys():
            self.gridlay.add_widget(self.checkboxses[i][0])
            self.gridlay.add_widget(i)
    def checkboxsfunc(self,checkbox,value):
        if value:
           self.t.append(self.chosedcheckbox)
        else:
           self.t.delete(self.chosedcheckbox)
        print(self.chosedcheckbox)
if __name__ == '__main__':
    checkbclass().run()