No more web GUI after upgrade to 6.2.0

Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: [Mon Nov 24 22:51:39 2014] [warn] Useless use of AllowOverride in line 12 of /etc/frontview/apache/fv-admin.conf.
Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: [Mon Nov 24 22:51:39 2014] [warn] Useless use of AllowOverride in line 25 of /etc/frontview/apache/fv-admin.conf.
Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: [Mon Nov 24 22:51:39 2014] [warn] Useless use of AllowOverride in line 4 of /etc/frontview/apache/apps-https.conf.
Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: [Mon Nov 24 22:51:39 2014] [warn] Useless use of AllowOverride in line 7 of /apps/avplus/https.conf.
Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: [Mon Nov 24 22:51:39 2014] [warn] Useless use of AllowOverride in line 3 of /apps/mysqlr6/https.conf.
Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: [Mon Nov 24 22:51:39 2014] [warn] Useless use of AllowOverride in line 3 of /apps/piwigo/https.conf.
Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: [Mon Nov 24 22:51:39 2014] [warn] Useless use of AllowOverride in line 3 of /apps/surveillance/https.conf.
Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: Syntax error on line 1 of /etc/apache2/sites-enabled/090-jenkins.conf:
Nov 24 22:51:39 nas-D5-FE-B8 apache2[5494]: Invalid command 'ProxyPreserveHost', perhaps misspelled or defined by a module not included in the server configuration
Nov 24 22:51:39 nas-D5-FE-B8 systemd[1]: apache2.service: control process exited, code=exited status=1
Nov 24 22:51:39 nas-D5-FE-B8 systemd[1]: Unit apache2.service entered failed state.
Nov 24 22:51:40 nas-D5-FE-B8 systemd[1]: apache2.service holdoff time over, scheduling restart.
Nov 24 22:51:40 nas-D5-FE-B8 systemd[1]: apache2.service: control process exited, code=exited status=1
Nov 24 22:51:40 nas-D5-FE-B8 systemd[1]: Unit apache2.service entered failed state.
Nov 24 22:51:40 nas-D5-FE-B8 systemd[1]: apache2.service holdoff time over, scheduling restart.
Nov 24 22:51:40 nas-D5-FE-B8 systemd[1]: apache2.service: control process exited, code=exited status=1
Nov 24 22:51:40 nas-D5-FE-B8 systemd[1]: Unit apache2.service entered failed state.
Nov 24 22:51:41 nas-D5-FE-B8 systemd[1]: apache2.service holdoff time over, scheduling restart.
Nov 24 22:51:41 nas-D5-FE-B8 systemd[1]: apache2.service: control process exited, code=exited status=1
Nov 24 22:51:41 nas-D5-FE-B8 systemd[1]: Unit apache2.service entered failed state.

vi /etc/apache2/sites-enabled/090-jenkins.conf

        ProxyPreserveHost       Off
        ProxyPass               /jenkins        http://localhost:8180/jenkins
        ProxyPassReverse        /jenkins        http://localhost:8180/jenkins

        <Proxy  http://localhost:8180/jenkins*>
                Order   allow,deny
                Allow   from all
        </Proxy>