python kivy

前提・実現したいこと

python kivy で　ネットのサンプルコードを実行したところエラーが発生しました。

発生している問題・エラーメッセージ

Traceback (most recent call last):
   File "main.py", line 95, in <module>
     MyPaintApp().run() 
   File "C:\Users\tocch\Anaconda3\envs\opencv\lib\site-packages\kivy\app.py", line 828, in run
     self.load_kv(filename=self.kv_file)
   File "C:\Users\tocch\Anaconda3\envs\opencv\lib\site-packages\kivy\app.py", line 599, in load_kv
     root = Builder.load_file(rfilename)
   File "C:\Users\tocch\Anaconda3\envs\opencv\lib\site-packages\kivy\lang\builder.py", line 290, in load_file
     data = fd.read()
 UnicodeDecodeError: 'cp932' codec can't decode byte 0xef in position 370: illegal multibyte 
sequence

該当のソースコード

main.py

from random import random
from kivy.app import App
from kivy.config import Config
import clip
import cv2
import os

# 起動時の解像度の設定
Config.set('graphics', 'width', '1024')
Config.set('graphics', 'height', '768')  # 16:9
Config.set('graphics', 'resizable', False)  # ウインドウリサイズ禁止

from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.graphics import Color, Ellipse, Line
from kivy.properties import ObjectProperty
from kivy.uix.behaviors import ToggleButtonBehavior
from kivy.uix.togglebutton import ToggleButton
from kivy.utils import get_color_from_hex   # 色の16進数表示を可能にする
from kivy.core.window import Window

class MyPaintWidget(Widget):
    #pass
    last_color = '' # 画面クリアを押された場合の最後の色
    line_width = 3  # 線の太さ

    def on_touch_down(self, touch):
        if Widget.on_touch_down(self, touch):
            return


        color = (random(), 1, 1)
        with self.canvas:
            touch.ud['line'] = Line(points=(touch.x, touch.y), width=self.line_width)

    def set_line_width(self, line_width=3):
        self.line_width = line_width

    def on_touch_move(self, touch):
        if touch.ud:    # スライダーを動かす際のエラーを解除するため
            touch.ud['line'].points += [touch.x, touch.y]

    def set_color(self, new_color):
        self.last_color = new_color
        self.canvas.add(Color(*new_color))

class MyCanvasWidget(Widget):

    def clear_canvas(self):
        MyPaintWidget.clear_canvas(self)


class MyPaintApp(App):

    def __init__(self, **kwargs):
        super(MyPaintApp, self).__init__(**kwargs)
        self.title = '画像表示'

    def build(self):
        parent = Widget()
        self.painter = MyCanvasWidget()

        # 起動時の色の設定を行う
        self.painter.ids['paint_area'].set_color(get_color_from_hex('#000000'))  #黒色を設定
        return self.painter

    def clear_canvas(self):
        self.painter.ids['paint_area'].canvas.clear()
        self.painter.ids['paint_area'].set_color(self.painter.ids['paint_area'].last_color)

    def save_canvas(self):        
        if not os.path.exists("\base"):
               os.makedirs("\base")

        filename_base = 'sample.png'
        img_path = Window.screenshot("base\" + filename_base)   # スクリーンショットを保存する
        basename = os.path.basename(img_path)
        img = cv2.imread("base\" + basename)
        cv2.rectangle(img, (0, 0), (78, 39), (255, 255, 255), thickness=-1)
        img = img[0:637, 0:1024]
        clip.mask_and_alpha(img, clip.maskgenerate(img, basename), basename)

class ColorButton(ToggleButton):
    def _do_press(self):
        if self.state == 'normal':
            ToggleButtonBehavior._do_press(self)# ボタンを押されてない場合は状態を変更する


if __name__ == '__main__':
    if(get_color_from_hex == None):
        Window.clearcolor = (1, 1, 1, 1)
    else:
        Window.clearcolor = get_color_from_hex('#ffffff')   # ウィンドウの色を白色に変更する

    MyPaintApp().run()

mypain.kv

#:import hex_color kivy.utils.get_color_from_hex

<ColorButton>:
    background_normal: 'color_button_normal.png'
    background_down: 'color_button_down.png'
    group: 'color'
    border: (5, 5, 5, 5)
    on_release: app.painter.ids['paint_area'].set_color(self.background_color)
    #on_release: app.painter.paint_id.set_color(self.background_color) # こ�?�方法でもset_corlorにアクセス可能
<MyCanvasWidget>:
    paint_id:paint_area
    id: canvas_area

    test:button1
    Button:
        text: 'save'
        color: 1, 1, 1 , 1
        font_size: 20
        on_release: app.save_canvas()
        border: (2, 2, 2, 2)
        x: 0
        top: root.top
        width: 80
        height: 40

    BoxLayout:
        orientation: 'vertical'
        height: root.height

        width: root.width
        MyPaintWidget:
            id: paint_area
            size_hint_y: 0.8

        BoxLayout:
            orientation: 'horizontal'
            size_hint_y: 0.1
            Label:
                size_hint_x: 0.1
                text: 'Line width %s' % int(s1.value) if s1.value else 'Line width not set'
                color: 0,0,0,1
            Slider:
                id: s1
                size_hint_x: 0.9
                value: 3
                range: (1,100)
                step: 1
                on_touch_down:app.painter.ids['paint_area'].set_line_width(self.value)

        BoxLayout:
            orientation: 'horizontal'
            size_hint_y: 0.1
            clear_btn:button1
            Button:
                id: button1
                text: "Clear"
                ont_size: 30
                on_release: app.clear_canvas()


            ColorButton:
                text: "white "
                color: 0, 0, 0 , 1
                background_color: hex_color('#ffffff')

            ColorButton:
                text: "black "
                state: 'down'
                background_color: hex_color('#000000')

            ColorButton:
                text: "red "
                background_color: hex_color('#ff0000')

            ColorButton:
                text: "biue "
                background_color: hex_color('#0000ff')

            ColorButton:
                text: "green "
                background_color: hex_color('#008000')

            ColorButton:
                text: "orange"
                background_color: hex_color('#ff4500')

            ColorButton:
                text: "purple"
                background_color: hex_color('#800080')