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The message means you are meeting another part of your model when you try to pushpull that face. Try tapping the Ctrl key, to display a + sign beside the push-pull cursor. That leaves a face behind and will allow you to push-pull past the sticking point.
You’re probably running into another face or a diagonal edge.
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As the guys above have said, it’s nothing special, you’ve run into an edge. Here is one way to reproduce it, and the ctrl to pass through.
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thank you very much! it works!