Solved Installation of tpm-emulator fails on FreeBSD 9.3

root@spitfire:/home/hark # pkg upgrade gnutls
Updating FreeBSD repository catalogue...
Fetching meta.txz: 100%    968 B   1.0kB/s    00:01
Fetching packagesite.txz: 100%    5 MiB   1.9MB/s    00:03
Processing entries: 100%
FreeBSD repository update completed. 25260 packages processed.
pkg: gnutls has a missing dependency: trousers-tddl
Checking integrity... done (0 conflicting)
The following 3 package(s) will be affected (of 0 checked):

New packages to be INSTALLED:
        trousers: 0.3.14_1
        tpm-emulator: 0.7.4_1

Installed packages to be UPGRADED:
        gnutls: -> 3.4.16

Number of packages to be installed: 2
Number of packages to be upgraded: 1

The process will require 3 MiB more space.

Proceed with this action? [y/N]: y
[1/3] Installing tpm-emulator-0.7.4_1...
===> Creating groups.
Using existing group '_tss'.
===> Creating users
Creating user '_tss' with uid '601'.
pw: user '_tss' already exists
pkg: PRE-INSTALL script failed