cannot restart or start apache via plesk

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cannot restart or start apache via plesk - apache is off (green arrow is showing)
it gives me that error when i try to start apache:

ERROR: PleskFatalException
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Unable to make action: Unable to manage service by websrvmng: websrvmng: Service httpd failed to start

0: /usr/local/psa/admin/plib/common_func.php3:169
psaerror(string 'Unable to make action: Unable to manage service by websrvmng: websrvmng: Service httpd failed to start')
1: /usr/local/psa/admin/htdocs/server/restart_services.php:30

i also did this commandline:
/var/log/httpd$ /etc/init.d/apache2 start
-bash: line 34: /etc/init.d/apache2: No such file or directory

and i did this:

/var/log/httpd$ /etc/init.d/httpd start
Syntax error on line 13 of /var/www/vhosts/mysite.com/conf/httpd.include:
Invalid command 'SuexecUserGroup', perhaps mis-spelled or defined by a module not included in the server configuration
httpd starten: [FEHLGESCHLAGEN]

und das auch:
/var/log/httpd$ /etc/init.d/httpd restart
Syntax error on line 13 of /var/www/vhosts/mysite.com/conf/httpd.include:
Invalid command 'SuexecUserGroup', perhaps mis-spelled or defined by a module not included in the server configuration
httpd beenden: [FEHLGESCHLAGEN]

httpd starten: [FEHLGESCHLAGEN]