wx._core.wxAssertionError: C++ assertion "!

[walynlee]

File "D:\walyn\myvi-master\myvi\canvas3d.py", line 158, in init
tsizer.Add( self.btn_color, 0, wx.ALIGN_CENTER|wx.ALL|(0, wx.EXPAND)[platform.system() in ['Windows', 'Linux']], 0 )
wx._core.wxAssertionError: C++ assertion "!(flags & (wxALIGN_BOTTOM | wxALIGN_CENTRE_VERTICAL))" failed at ....\src\common\sizer.cpp(2184) in wxBoxSizer::DoInsert(): Vertical alignment flags are ignored with wxEXPAND

How can I handle this problem? please