fetch failed error 500

[宫照]

Hi All,

When I am using nutch to crawl url like this* http://
*******.com/cases/tcsg2html.pl?2321543*

It get the error like
*fetch of http://*******.com/cases/046418 failed with: Http code=50
0, url=http://*******.com/cases/046418*

Do you know the reason of  this ?

Regards,

Gong Zhao