Desktop Agent Unavailable

Hello ! I’m new to postman… and i want to do a localhost request, the site tell me to use the desktop agent… i’ve download it, but i still have the problem, even if postman is launch etc,
Its keep telling me the same things :
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in the bottom…
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and in my task bar…
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(I’ve open postman with the button Open Postman … and i refresh the page much time …)