php - Facebook api keeps returning " authorization code has been used ." even though I get logged in .. what's the cause? -

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so have error trying fix in code below , api returns code below

error: exception occured getting facebook session message: authorization code has been used... cause ?

function setredirectloginsession(){         $helper = new facebook\facebookredirectloginhelper($this->redirecturi);         try {             if(!($this->facebooksession instanceof facebook\facebooksession)){                 $this->facebooksession = $helper->getsessionfromredirect();             } else {                 //if coming facebook app have signed request                 if(isset($_request['signed_request']) ){                     $this->facebooksession = facebook\facebooksession::newsessionfromsignedrequest($_request['signed_request']);                 }else{                     $is_valid = $this->facebooksession->validate($this->client_id,$this->client_secret);                     if(!$is_valid)                         $this->newfbsession();                 }             }         } catch(facebookrequestexception $ex) {             systemerror("facebookrequestexception occured getting facebook session message: " . $ex->getmessage());         } catch(\exception $ex) {             systemerror("exception occured getting facebook session message: " . $ex->getmessage());         }     }


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