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copied!<p>It looks like it's complaining about argument 4 not being a wxWindow (hence the <code>argument 4 of type 'wxWindow *'</code> part of the error).</p> <p>Looking at your call, argument 4 is passing <code>parent=self</code>. So, what is <code>self</code>? In other words, what class is the method with this code a part of? Is it something that's a <code>wx.Window</code> or subclass of one, or is it something like an <code>Application</code> or a <code>Progress</code> that isn't?</p> <p>(Actually, given that you're passing <code>parent</code> as a keyword argument, it's just a coincidence that it happened to be in the 4th position in your call to the <code>wx.ProgressDialog</code> constructor and also be in the 4th position to the call to the underlying C++ function, which is what's actually complaining. You'd get the same error if you switched <code>maximum</code> and <code>parent</code>, and I think it would still say <code>argument 4</code> instead of <code>argument 3</code>.)</p> <p>To verify this, try taking out the <code>parent=self</code> in the call that fails, and it should work, or adding <code>parent=object()</code> to the call with just <code>None</code> that works, and it should fail.</p> <p>Of course that doesn't actually <em>fix</em> the problem. But to do that, you have to figure out what you wanted the <code>parent</code> to be and pass that instead of <code>self</code>.</p> <p>PS, I don't think the problem has anything to do with your threading at all.</p>

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