[Koha] 500 Error message on upgrading to 2.2.6

[Carol Ku]

I just upgraded Koha to 2.2.6 on Windows XP.  However, I encountered the following error message: Error 500 Internal server error.  see attached error log.
   
  I encountered the same error message while trying to access opac and intranet.

 		
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[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] Premature end of script headers: mainpage.pl
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] Can't locate MARC/File/XML.pm in @INC (@INC contains: c:/usr/koha226/modules C:/usr/lib C:/usr/site/lib .) at c:/usr/koha226/modules/C4/Biblio.pm line 1047.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] BEGIN failed--compilation aborted at c:/usr/koha226/modules/C4/Biblio.pm line 1047.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] Compilation failed in require at c:/usr/koha226/modules/C4/Search.pm line 28.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] BEGIN failed--compilation aborted at c:/usr/koha226/modules/C4/Search.pm line 28.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] Compilation failed in require at c:/usr/koha226/modules/C4/Reserves2.pm line 29.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] BEGIN failed--compilation aborted at c:/usr/koha226/modules/C4/Reserves2.pm line 29.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] Compilation failed in require at c:/usr/koha226/modules/C4/Circulation/Circ2.pm line 35.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] BEGIN failed--compilation aborted at c:/usr/koha226/modules/C4/Circulation/Circ2.pm line 35.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] Compilation failed in require at c:/usr/koha226/modules/C4/Auth.pm line 30.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] BEGIN failed--compilation aborted at c:/usr/koha226/modules/C4/Auth.pm line 30.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] Compilation failed in require at C:/usr/koha226/intranet-cgi/mainpage.pl line 9.
[Wed Oct 25 15:13:59 2006] [error] [client 127.0.0.1] BEGIN failed--compilation aborted at C:/usr/koha226/intranet-cgi/mainpage.pl line 9.