Plesk 500 -Internal Server Error after Upgrade from 8.6

[Takashi Iwasaki]

hi, I'm japanese.

I update from 8.6 to 9.0.1.
https://hostname:8443/ is "500 - Internal Server Error"...

help me...

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/usr/bin/sw-engine-cgi: relocation error: /usr/bin/sw-engine-cgi: undefined symbol: PQescapeByteaConn
2009-04-09 03:42:30: (mod_fastcgi.c.1004) the fastcgi-backend /usr/bin/sw-engine-cgi -c /opt/psa/admin/conf/php.ini -d auto_prepend_file=auth.php3 -u psaadm failed to start:
2009-04-09 03:42:30: (mod_fastcgi.c.1008) child exited with status 127 /usr/bin/sw-engine-cgi -c /opt/psa/admin/conf/php.ini -d auto_prepend_file=auth.php3 -u psaadm
2009-04-09 03:42:30: (mod_fastcgi.c.1011) if you try do run PHP as FastCGI backend make sure you use the FastCGI enabled version.
You can find out if it is the right one by executing 'php -v' and it should display '(cgi-fcgi)' in the output, NOT (cgi) NOR (cli)
For more information check http://www.lighttpd.net/documentation/fastcgi.html#preparing-php-as-a-fastcgi-program
2009-04-09 03:42:30: (mod_fastcgi.c.1016) If this is PHP on Gentoo add fastcgi to the USE flags
2009-04-09 03:42:30: (mod_fastcgi.c.1109) [ERROR]: spawning fcgi failed.