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sailjapan,
I don't think these are related. The error in /class/article.php (line 613) either delete the line or comment it out like this:
// $this = false;
$this can't be used as a 'variable' in a class in PHP5, $this has a special meaning. Setting it = false doesn't really make sense in this context.
The other issue looks to be the code calling the WfsArticle::$groupid. It's already been defined somewhere else and the code is trying to declare it again.