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window = NSApplication.sharedApplication().mainWindow()
window.contentView().addSubview_(chart_view)
The window was made in another section and appears fine but I get this:
:
‘NoneType’ object has no attribute
‘contentView’
Does anyone know why it thinks the window is “NoneType”? Thankyou.
It looks like
mainWindow()is returningNone, which suggests that there is no active window or something like that.