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this error from the last 20 minutes while printing anything... other software working fine. please help

That is a message that you get when the client disconnects before the response has been completely sent. It can happen because your users leave the site while the request is being sent or, if you are accessing the site from a program (like javascript in the browser or a Python script), because the timeout on the request is shorter than the time that it takes your web app to respond.