Does the service actually work or is the error message meaningful?
I'm asking because I had a similar error message when starting/stopping services using systemd and it turns out it was because I had run out of inotify watches. The reason for running out of those in my case was because I was running the CrashPlan backup software: http://support.code42.com/CrashPlan/Latest/Troubleshooting/Real-Time_Backup_For_Network-Attached_Drives#linux
Another thing to look at is to see if you have run out of inodes on your filesystem: df -ih