Error installing Nginx Debian7

[TarasS]

I'm getting error while trying to install Nginx on Debian version 7.8

Installing packages
Reading package lists...
Building dependency tree...
Reading state information...
php5-fpm is already the newest version.
psa-kav8:i386 is already the newest version.
The following packages were automatically installed and are no longer required:
librdbmspp platform-runtime sw-libboost-date-time1.49.0
sw-libboost-filesystem1.49.0 sw-libboost-regex1.49.0
sw-libboost-serialization1.49.0 sw-libboost-system1.49.0
sw-libboost-thread1.49.0
Use 'apt-get autoremove' to remove them.
The following NEW packages will be installed:
sw-nginx
0 upgraded, 1 newly installed, 0 to remove and 58 not upgraded.
1 not fully installed or removed.
Need to get 0 B/327 kB of archives.
After this operation, 813 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
sw-nginx
Authentication warning overridden.
Selecting previously unselected package sw-nginx.
(Reading database ... 123227 files and directories currently installed.)
Unpacking sw-nginx (from .../sw-nginx_1.6.0-1.14051516.debian70_amd64.deb) ...
Processing triggers for man-db ...
Setting up php5-fpm (5.4.39-0+deb7u2) ...
insserv: warning: script 'kavehost' missing LSB tags and overrides
insserv: There is a loop between service monit and kavehost if stopped
insserv: loop involving service kavehost at depth 2
insserv: loop involving service monit at depth 1
insserv: Stopping kavehost depends on monit and therefore on system facility `$all' which can not be true!
insserv: exiting now without changing boot order!
update-rc.d: error: insserv rejected the script header
dpkg: error processing php5-fpm (--configure):
subprocess installed post-installation script returned error exit status 1
Setting up sw-nginx (1.6.0-1.14051516.debian70) ...
update-rc.d: using dependency based boot sequencing
insserv: warning: script 'kavehost' missing LSB tags and overrides
insserv: There is a loop between service monit and kavehost if stopped
insserv: loop involving service kavehost at depth 2
insserv: loop involving service monit at depth 1
insserv: Stopping kavehost depends on monit and therefore on system facility `$all' which can not be true!
insserv: exiting now without changing boot order!
update-rc.d: error: insserv rejected the script header
Errors were encountered while processing:
php5-fpm
E: Sub-process /usr/bin/dpkg returned an error code (1)
Synchronizing the Debian APT package index files...

ERROR: An error occurred on attempt to install packages.
Attention! Your software might be inoperable.
Please, contact product technical support.

 

[TarasS]

I've solved this problem using commands:
# mv -fv /etc/init.d/monit /root/backup/
# update-rc.d -f monit remove
# apt-get remove monit
And then I was able to run Plesk installer normally
# ./parallels_installer
I've installed both Nginx + PHP-FPM normally.