Unknowen Error

Uncaught error with message 'E_NOTICE: unserialize(): Error at offset 281 of 281 bytes'

330: //seo
331: $postmeta = $this->getPostmeta();
332: $postmeta->populate(array('post_id' => $posts->ID, 'meta_key' => 'post_seo_meta_tags'));
333:
334: if ($meta_value = $postmeta->meta_value) {
335: $meta_value = unserialize($meta_value);
336: $postmeta->set('meta_value', $meta_value);
337: $posts->set('seotitle', $meta_value['title']);
338: }
339:

#9 E:\wwwroot\m.skymigration.com\web\bk\wind\base\AbstractWindFrontController.php (245)
#8 ~Internal Location~ (N/A) _errorHandle(8,"unserialize(): Error at offset 281 of 281 bytes","E:\wwwroot\m.skymigration.com\web\bk\apps\alibaike\src\service\d…",335,array( 'post_name' => '165655', 'posts' => NULL, 'postmeta' => NULL, 'meta_value' => 'a:3:{s:5:"title";s:28:"2015年加拿大移民政策";s:8:"keywords";s:21:"加拿大移民政策";s:11:"description";s:158:"在2015年，加拿大移民政策将会继续发生变化。对于2015年的加拿大移民新政策，在凌宇移民中有人给出了预测和解析。";}', ))
#7 E:\wwwroot\m.skymigration.com\web\bk\apps\alibaike\src\service\dm\PostsDm.php (335) unserialize("a:3:{s:5:"title";s:28:"2015年加拿大移民政策";s:8:"keywor…")
#6 E:\wwwroot\m.skymigration.com\web\bk\apps\m\src\controller\IndexController.php (18) getPostByPostName("165655")
#5 E:\wwwroot\m.skymigration.com\web\bk\wind\web\WindSimpleController.php (48) run()
#4 E:\wwwroot\m.skymigration.com\web\bk\wind\base\AbstractWindApplication.php (90) doAction(WindRouter)
#3 E:\wwwroot\m.skymigration.com\web\bk\wind\base\AbstractWindFrontController.php (205) run(WindRouter)
#2 E:\wwwroot\m.skymigration.com\web\bk\wind\web\WindWebFrontController.php (20) run()
#1 E:\wwwroot\m.skymigration.com\web\bk\index.php (19) run()