お忙しいところすみません。
知り合いがVIP鯖に書き込もうとするとHTTP/1.1 500 Internal Server Error表示が出るんですが
どういった原因が考えられますか？moperaです。

When trying to write in a VIP server, that was indicated by a server error inside HTTP/1.1 500.
That's ISP docomo mopera.

Please, please speak to me about the cause.