Kindly stop the content library service and start and try to delete .
service-control --stop vmware-vdcs
service-control --start vmware-vdcsRAJESH RADHAKRISHNAN
VCA -DCV/WM/Cloud,VCP 5 - DCV/DT/CLOUD, ,VCP6-DCV, EMCISA,EMCSA,MCTS,MCPS,BCFA
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Pretty late to this thread, but I had the same issue. I found the solution on http://subnet192.com/?p=794.
Additionally, the content library service is named "vmware-content-library" in 6.7U1, in case a restart of the service works for you.
I had the same problem, i tried all the above. in another vcenter, restarting the content library service from the vami worked. in the other vcenter, i disconnected the cdrom that was accessing the content library other file in .iso and managed to delete the library.