Why won't the compiled python kivy program run?

Question

Python

I have windows 10 pro.

Wrote a program in python kivy.

from kivy.app import App
from  kivy.uix.gridlayout import GridLayout
from  kivy.uix.button import Button
from  kivy.uix.label import Label
from  kivy.uix.boxlayout import BoxLayout
from kivy.config import  Config



#Config.set('graphics','resizable',0)
#Config.set('graphics','width',400)
#Config.set('graphics','height',500)

class mainApp(App):

    def plm(self,instance):
        self.formula=str(int(self.formula) - int(self.formula)*2)
        self.lbl.text=self.formula

    def kv(self,instance):

        self.formula=str(int(self.formula) * int(self.formula))
        self.lbl.text=self.formula
    def kub(self,instance):

        self.formula=str(int(self.formula) * int(self.formula)* int(self.formula))
        self.lbl.text=self.formula


    def clean(self,instance):
        self.lbl.text = "0"
        self.formula = "0"

    def result(self,instance):
        exit=eval(self.lbl.text)
        if exit%1==0:
            exit=int(exit)
        self.lbl.text = str(exit)
        self.formula = str(exit)

    def update_label(self):
        self.lbl.text = self.formula


    def add_operation(self,instance):
        if ( str(instance.text).lower()=='x'):
            self.formula+=("*")
        else:

            if ( str(instance.text).lower()==':'):
                self.formula+=("/")

            else:
                self.formula+=str(instance.text)


        self.update_label()

    def add_num(self,instance):



        if (self.formula == "0"):
            self.formula=""
        self.formula+=str(instance.text)
        print(self.formula)
        self.update_label()
        

    def build(self):

        self.formula=""
        bls = BoxLayout (orientation = 'vertical')
        gls = GridLayout(cols = 4,size_hint = (1,.6))

    
        class btn(Button):
            font_size=30
            
        self.lbl=Label(text="0",font_size=35,halign="right",valign="center",size_hint=(1,.450),text_size=(400-50,500*.4-50))
        bls.add_widget(self.lbl)

        gls.add_widget(btn(text="7",on_press=self.add_num))
        gls.add_widget(btn(text="8",on_press=self.add_num))
        gls.add_widget(btn(text="9",on_press=self.add_num))
        gls.add_widget(btn(text="x",on_press=self.add_operation))

        gls.add_widget(btn(text="4",on_press=self.add_num))
        gls.add_widget(btn(text="5",on_press=self.add_num))
        gls.add_widget(btn(text="6",on_press=self.add_num))
        gls.add_widget(btn(text="-",on_press=self.add_operation))

        gls.add_widget(btn(text="1",on_press=self.add_num))
        gls.add_widget(btn(text="2",on_press=self.add_num))
        gls.add_widget(btn(text="3",on_press=self.add_num))
        gls.add_widget(btn(text="+",on_press=self.add_operation))
        
        gls.add_widget(btn(text=":",on_press=self.add_operation))
        gls.add_widget(btn(text="0",on_press=self.add_num))
        gls.add_widget(btn(text=".",on_press=self.add_num))
        gls.add_widget(btn(text="=",on_press=self.result))

        gls.add_widget(btn(text="AC",on_press=self.clean))
        gls.add_widget(btn(text="x²",on_press=self.kv))
        gls.add_widget(btn(text="x³",on_press=self.kub))
        gls.add_widget(btn(text="±",on_press=self.plm))

        bls.add_widget(gls)

        return(bls)
    


mainApp().run()
a=input()

Compiled to exe....

Here's what happens:

Everything works in python: