Networker process fails to start - Mac OS X Yosemite

I cannot get the Networker client to run on an OS X Yosemite Mac. I've tried all recent versions up to 8.2.1, but the errors are consistent:

01/04/2015 18:07:31.449 com.apple.xpc.launchd[1]: (com.emc.NetWorker[15015]) Service could not initialize: Unable to set current working directory. error=20, path=/nsr/cores/nsrexecd: 14C1514: xpcproxy + 12907 [1227][63706214-56DC-3155-B46F-D4F21C9B1C0B]: 0x14

01/04/2015 18:07:31.449 com.apple.xpc.launchd[1]: (com.emc.NetWorker) Service only ran for 0 seconds. Pushing respawn out by 10 seconds.

These errors repeat endlessly until I run `sudo /bin/launchctl stop com.emc.NetWorker`. It would appear that /nsr/cores/nsrexecd doesn't exist on the computer, but an attempt is being made to utilise it in some way.

I was really hoping that 8.2.1 would fix the problem, but alas no. Has anyone else encountered these errors and resolved the problem?

Thanks,

Graham