Fatal error: Namespace declaration

I can not understand why this error pops up. Here is the code of the file, in which the error Fatal error is: </ in / var / www / html / phpinstagram / phpinstagram / Instagram.php on line 2

<? namespace phpinstagram; class Instagram { /* * @var array */ protected $_commands = array(); /* * @var \phpinstagram\Instagram\Client\Communication */ protected $_communication; /* * @var \phpinstagram\Instagram\Api\Feed */ public $feed; /* * @var \phpinstagram\Instagram\Api\Auth */ public $auth; public function __construct() { $this->feed = new \phpinstagram\Instagram\Api\Feed(); $this->feed->setInstagram($this); $this->auth = new \phpinstagram\Instagram\Api\Auth(); $this->auth->setInstagram($this); $this->_communication = new \phpinstagram\Instagram\Client\Communication(); } public function addCommand(\phpinstagram\Instagram\Command\ICommand $cmd) { $this->_commands[] = $cmd; } public function run() { $executed = array(); //$cookieJar = null; foreach ($this->_commands as $utcmd) { if ($utcmd instanceof \phpinstagram\Instagram\Command\ICommand) { /* * @var \phpinstagram\Instagram\Command\ICommand */ $cmd = $utcmd; //if (!is_null($cookieJar)) // $this->_communication->getClient()->setCookieJar($cookieJar); foreach ($cmd->dependsOn() as $dependency) { foreach ($executed as $previous) { if (get_class($previous) == '\Instagram\Command\\' . $dependency) { break 2; } } throw new \phpinstagram\Instagram\Command\DependencyException( 'Command ' . get_class($cmd) . " depends on $dependency but it never was executed!\n\n" ); } $cmd->setCommunication($this->_communication); $cmd->validate(); //echo get_class($cmd)." is valid. executing...\n\n"; $cmd->exec(); $executed[] = $cmd; // reset parameters $this->_communication->getClient()->resetParameters(); //$cookieJar = $this->_communication->getClient()->getCookieJar(); } } // reset commands $this->_commands = array(); } 

}