Publishing has been cancelled.

Hello,
When I try to generate and publish my already the WebHelp documentation on my FTP, you are giving this error message below.

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Responsive HTML5

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Publishing has been cancelled.

Failed to create directory: _Portais.

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OK  

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But the settings, I put as it is in FileZilla, FileZilla and functions normally. What can it be? Images below.

I'm waiting for answers.
Thank you very much.