请帮我看看这个python运行的错误提示是什么意思呢？谢谢

Python code

import wxclass ToolbarFrame(wx.Frame):    def __init__(self, parent, id):        wx.Frame.__init__(self, parent, id, '工具栏', size=(600, 300))        panel = wx.Panel(self)        panel.SetBackgroundColour('Red')        toolbar = self.CreateToolBar() #创建工具栏        toolbar.AddSimpleTool(wx.NewId(), wx.Image('ico/xin.png', wx.BITMAP_TYPE_PNG).ConvertToBitmap(), "New")        toolbar.AddSimpleTool(wx.NewId(), wx.Image('ico/xin.png', wx.BITMAP_TYPE_PNG).ConvertToBitmap(), "Save")        toolbar.AddSimpleTool(wx.ID_DELETE, wx.Image('ico/abc.png', wx.BITMAP_TYPE_PNG).ConvertToBitmap(), "Delete")        toolbar.AddSimpleTool(wx.ID_EXIT, wx.Image('ico/exit.png', wx.BITMAP_TYPE_PNG).ConvertToBitmap(), "Exit")        toolbar.SetToolBitmapSize(wx.Size(10, 10))        toolbar.Realize() #准备显示工具栏        statusbar = self.CreateStatusBar() #创建壮态栏        statusbar.SetStatusText("版权所有你这个王88") #给壮态栏添加信息        #绑定事件,用id来绑定事件        self.bind(wx.EVT_TOOL, self.OnExit, id=wx.ID_EXIT)        self.bind(wx.EVT_TOOL, self.OnDelete, id= wx.ID_DELETE)    def OnExit(self, event):        dlg = wx.MessageDialog(None, '确定要退出程序吗?', '程序退出提示', wx.YES_NO | wx._ICON_QUESTION)        result = dlg.ShowModal()        #如果点击是按钮        if result == wx.ID_YES:            self.Close(True)        dlg.Destroy()    def OnDelete(self, event):        dlg = wx.MessageDialog(None, '你确定要删 除数据吗？', '删除数据提示', wx.YES_NO | wx.ICON_QUESTION)        result = dlg.ShowModal()        if result == wx.ID_YES:            mydialog = MyDialog(parent = None, id = -1, title = '删队')        dlg.Destroy()class MyDialog(wx.Dialog):    def __init__(self, parent,id,title):        wx.Dialog.__init__(self, parent, id, title, size=(200, 200))        self.panel = wx.Panel(self)        #向对话框添加按钮        self.OkBtn = wx.Button(self, 10, '确定', pos=(50, 100), size=(80, 40))        #绑定事件        self.Bind(wx.EVT_TUTTON, self.CloseDlg, self.OkBtn)        self.Show()    def CloseDlg(self, event):        self.Close()if __name__ == "__main__":    app = wx.PySimpleApp()    #实例化ToolbarFrame类    frame = ToolbarFrame(parent=None, id= -1)    frame.Show()    app.MainLoop()

这是错误提示？

Python code

Traceback (most recent call last):  File "F:/python/pyweb/wx_2.py", line 46, in <module>    frame = ToolbarFrame(parent=None, id= -1)  File "F:/python/pyweb/wx_2.py", line 8, in __init__    toolbar.AddSimpleTool(wx.NewId(), wx.Image('ico/xin.png', wx.BITMAP_TYPE_PNG).ConvertToBitmap(), "New")  File "F:\Python27\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 3369, in ConvertToBitmap    return _core_.Image_ConvertToBitmap(*args, **kwargs)PyAssertionError: C++ assertion "image.Ok()" failed at ..\..\src\msw\bitmap.cpp(802) in wxBitmap::CreateFromImage(): invalid image

[解决办法]
少了图片，看看图片在不在，或者路径对不
[解决办法]
invalid image非法的图片，打印下查看图片或路径。