应用运行期间出现错误：ReferenceError：弱引用对象不再存在

如何解决应用运行期间出现错误：ReferenceError：弱引用对象不再存在

到目前为止，我正在学习开发的python kivy应用程序还算不错。我爱它

我已经到达一个导航菜单，其中带有“ admin”选项，可以选择显示带有菜单选项按钮小部件的屏幕。

库按钮单击将使用自定义小部件CustomView @ BoxLayout加载recycleview 退还书按钮将加载带有自定义小部件CustomResv @ BoxLayout的回收视图

附加书的输出以供参考-这是基于自定义小部件的回收视图

问题是我的应用正常运行，其中之一被评论为recycleviews。如果同时保留两者，则即使在看到应用程序的主屏幕（主屏幕以及使用屏幕管理器的带有导航抽屉的菜单屏幕是主屏幕）之前，我仍然得到以下信息：enter image description here

返回self.proxy不是None并且不是bool（dir（self.proxy）） ReferenceError：弱引用对象不再存在

关于如何调试根本原因和纠正问题的任何指示都将有助于我的旅程

下面的代码段

        Screen:
            name: "returns"
            size_hint_y: 1.0 - toolbar.height/root.height
            orientation: "vertical"
            spacing: 40
            padding:10,10
            space_x: self.size[0]/3
            BoxLayout:
                RS:
        Screen:
            name: "library"

            manager: screen_manager

            orientation: "vertical"
            spacing: 40
            padding:10,10
            space_x: self.size[0]/3
            BoxLayout:
                LS:

<CustomView@BoxLayout>:
size_hint_y: None
text1: ""
text2: ""
text3: ""
status: 9
GridLayout:
    size_hint_y: None
    height: self.minimum_height
    cols: 5
    Image:
        source: '/home/girish/Downloads/index.jpeg'
        size_hint_y: None
        valign: 'middle'
    MDLabel:
        valign: 'top'
        id: test_label1
        size_hint_y: None
        #size_hint: 1,None
        #on_size: root.height = self.height
        #text_size: root.width,None
        size: self.texture_size
        text: root.text1
        #color: [0,1,0]
    MDLabel:
        id: test_label2
        valign: 'top'
        size_hint_y: None
        #size_hint: 1,None
        size: self.texture_size
        text: root.text2
    MDLabel:
        id: test_label3
        valign: 'top'
        size_hint_y: None
        #size_hint: 1,None
        size: self.texture_size
        text: root.text3
    GridLayout:
        size_hint_y: None
        height: self.minimum_height
        cols: 1
        MDLabel:
            id: test_label3
            valign: 'top'
            size_hint_y: None
            #size_hint: 1,None
            #on_size: root.height = self.height
            #text_size: root.width,None
            size: self.texture_size
            text: 'Available from 01-Sep-2020'
        MDRectangleFlatButton:
            id: btn_reserve

            valign: 'top'
            size_hint_y: None

            text: 'Reserve'
            opacity: root.status

<LS>:
    viewclass: 'CustomView'  # defines the viewtype for the data items.
    RecycleBoxLayout:
        #color:(0,0.7,0.4,0.8)
        #default_size: None,dp(56)
        # defines the size of the widget in reference to width and height
        default_size_hint: 1,None
        size_hint_y: None
        height: self.minimum_height
        orientation: 'vertical' # defines the orientation of data items

<CustomResv@BoxLayout>:
size_hint: 1,None
text1: ""
text2: ""
text3: ""
status: 9
BoxLayout:
    cols: 5
    Image:
        size_hint_x: 0.4
        #valign: 'middle'
        source: '/home/girish/Downloads/index.jpeg'
    MDLabel:
        id: test_label1
        size_hint_y: None
        #size_hint: 1,None
        #on_size: root.height = self.height
        text_size: root.width,None
        size: self.texture_size
        text: root.text1
        valign: 'middle'
        #color: [0,0]
    MDLabel:
        id: test_label2
        size_hint_y: None
        #size_hint: 1,None
        size: self.texture_size
        text: root.text2
    MDLabel:
        id: test_label3
        size_hint_y: None
        #size_hint: 1,None
        size: self.texture_size
        text: root.text3
    MDRectangleFlatButton:
        id: btn_reserve1
        size_hint_y: None
        text: 'Returned'
        opacity: root.status

<RS>:
    viewclass: 'CustomResv'  # defines the viewtype for the data items.
    RecycleBoxLayout:
        color:(0,0.8)
        default_size: None,None
        size_hint_y: None
        height: self.minimum_height
        orientation: 'vertical' # defines the orientation of data items