mercuryboard has exited with an error

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Undefined index: f

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Notice [8]:
The error was reported on line 240 of /home/erinhart/www/www/forum/func/post.php

Code:
238
239             } else {
240                 if (!$this->perms->auth('post_noflood', $this->get['f']) && ($this->user['user_lastpost'] > ($this->time - $this->sets['flood_time']))) {
241                     return $this->message($this->lang->post_replying, sprintf($this->lang->post_flood, $this->sets['flood_time']));
242                 }

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