Systemctl enable failing

i started this command and got this error messages on red hat 7.0

[root@rhes7-0 /]# systemctl enable httpd.service
Failed to execute operation: No such file or directory
[root@rhes7-0 /]#systemctl enable mysql.service
Failed to execute operation: Too many levels of symbolic links

what should i do as this command worked below

[root@rhes7-0 /]#systemctl enable snmpd.service

Well the last command worked because well implemented, the others fail because not...
You are to start with do the file exist, am I to create symbolic links, in which case, where
if I find links, are they correct...
We cant say much more with what is given...

So what should I do?