Cannot start Squid proxy

I have some problem with my Squid proxy. I cannot start the proxy after
the proxy was down. From what I know, since yesterday I did not touch any Squid configuration. Then this morning I came to the office and it looked like it
was down. Refer the cache.log below:

2016/08/03 10:24:47| Unlinkd pipe opened on FD 16
2016/08/03 10:24:47| Swap maxSize 3584000 + 32768 KB, estimated 602794
objects
2016/08/03 10:24:47| Target number of buckets: 30139
2016/08/03 10:24:47| Using 32768 Store buckets
2016/08/03 10:24:47| Max Mem  size: 32768 KB
2016/08/03 10:24:47| Max Swap size: 3584000 KB
2016/08/03 10:24:47| Local cache digest enabled; rebuild/rewrite every
3600/3600 sec
2016/08/03 10:24:47| logfileOpen: opening log /var/log/squid/store.log
2016/08/03 10:24:47| Rebuilding storage in /var/spool/squid (DIRTY)
2016/08/03 10:24:47| Using Least Load store dir selection
2016/08/03 10:24:47| Current Directory is /
2016/08/03 10:24:47| Loaded Icons.
2016/08/03 10:24:47| Accepting proxy HTTP connections at
192.168.120.104, port 8080, FD 18.
2016/08/03 10:24:47| HTCP Disabled.
2016/08/03 10:24:47| WCCP Disabled.
Can't locate NTA/database/TechDb.pm in @INC (@INC contains:
/opt/nta/perl/lib/perl5 /etc/perl /usr/local/lib/perl/5.10.1
/usr/local/share/perl/5.10.1 /usr/lib/perl5 /usr/share/perl5
/usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl
/usr/local/lib/perl/5.10.0 .) at
/opt/squid_auth/script/squid_techdb_digest_auth.pl line 9.
BEGIN failed--compilation aborted at
/opt/squid_auth/script/squid_techdb_digest_auth.pl line 9.
2016/08/03 10:24:47| Ready to serve requests.
2016/08/03 10:24:47| WARNING: digestauthenticator #2 (FD 8) exited
2016/08/03 10:24:47| WARNING: digestauthenticator #3 (FD 9) exited
2016/08/03 10:24:47| WARNING: digestauthenticator #4 (FD 10) exited
2016/08/03 10:24:47| Too few digestauthenticator processes are running
FATAL: The digestauthenticator helpers are crashing too rapidly, need help!

Squid Cache (Version 2.7.STABLE9): Terminated abnormally.
CPU Usage: 0.028 seconds = 0.024 user + 0.004 sys
Maximum Resident Size: 22224 KB
Page faults with physical i/o: 0
Memory usage for squid via mallinfo():
        total space in arena:    2924 KB
        Ordinary blocks:         2854 KB      5 blks
        Small blocks:               0 KB      0 blks
        Holding blocks:           780 KB      3 blks
        Free Small blocks:          0 KB
        Free Ordinary blocks:      69 KB
        Total in use:            3634 KB 98%
        Total free:                69 KB 2%
Can't locate NTA/database/TechDb.pm in @INC (@INC contains:
/opt/nta/perl/lib/perl5 /etc/perl /usr/local/lib/perl/5.10.1
/usr/local/share/perl/5.10.1 /usr/lib/perl5 /usr/share/perl5
/usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl
/usr/local/lib/perl/5.10.0 .) at
/opt/squid_auth/script/squid_techdb_digest_auth.pl line 9.
BEGIN failed--compilation aborted at
/opt/squid_auth/script/squid_techdb_digest_auth.pl line 9.
Can't locate NTA/database/TechDb.pm in @INC (@INC contains:
/opt/nta/perl/lib/perl5 /etc/perl /usr/local/lib/perl/5.10.1
/usr/local/share/perl/5.10.1 /usr/lib/perl5 /usr/share/perl5
/usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl
/usr/local/lib/perl/5.10.0 .) at
/opt/squid_auth/script/squid_techdb_digest_auth.pl line 9.
BEGIN failed--compilation aborted at
/opt/squid_auth/script/squid_techdb_digest_auth.pl line 9.

Please advise.