Dear Sir/Madam, Our cataloging is showing the following error. We are unable to search or add books. Please help us to rectify the error. Software error: Undefined subroutine &main::/var/lib/koha/library/plugins called at (eval 1479) line 2. ...propagated at /usr/share/perl/5.18/base.pm line 83. BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/QueryParser/Driver/PQF/query_plan.pm line 20. Compilation failed in require at /usr/share/koha/lib/Koha/QueryParser/Driver/PQF.pm line 27. BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/QueryParser/Driver/PQF.pm line 27. For help, please send mail to the webmaster ([no address given]), giving this error message and the time and date of the error. Software error: [Mon Jul 24 15:11:51 2017] addbooks.pl: Undefined subroutine &main::/var/lib/koha/library/plugins called at (eval 1479) line 2. [Mon Jul 24 15:11:51 2017] addbooks.pl: ...propagated at /usr/share/perl/5.18/base.pm line 83. [Mon Jul 24 15:11:51 2017] addbooks.pl: BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/QueryParser/Driver/PQF/query_plan.pm line 20. [Mon Jul 24 15:11:51 2017] addbooks.pl: Compilation failed in require at /usr/share/koha/lib/Koha/QueryParser/Driver/PQF.pm line 27. [Mon Jul 24 15:11:51 2017] addbooks.pl: BEGIN failed--compilation aborted at /usr/share/koha/lib/Koha/QueryParser/Driver/PQF.pm line 27. Compilation failed in require at /usr/share/koha/lib/C4/Search.pm line 1402. For help, please send mail to the webmaster ([no address given]), giving this error message and the time and date of the error. We are using: Koha version:16.05.05.000OS version ('uname -a'):Linux ubuntu 3.16.0-33-generic #44~14.04.1-Ubuntu SMP Fri Mar 13 10:33:29 UTC 2015 x86_64Perl interpreter:/usr/bin/perlPerl version:5.018002Perl @INC:/usr/share/koha/lib /etc/perl /usr/local/lib/perl/5.18.2 /usr/local/share/perl/5.18.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.18 /usr/share/perl/5.18 /usr/local/lib/site_perl . MySQL version:mysql Ver 14.14 Distrib 5.5.53, for debian-linux-gnu (x86_64) using readline 6.3Apache version:Server version: Apache/2.4.7 (Ubuntu)Zebra version:Zebra 2.0.44 (C) 1994-2010, Index Data ApS Zebra is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. SHA1 ID: 419ad759807269fdfa379799a051ed3a551c6541 Using ICU Regards, *______________________________* Mrs. Ambika C.A. Librarian K.S. School of Engineering & Management #15, Mallasandra, Off. Kanakapura Road, BENGALURU - 560062 Ph: (080) 28425012 Extn: 200 Mob : 9036486519 <http://www.rediffmail.com/cgi-bin/red.cgi?red=http%3A%2F%2Flibrary%2Epes%2Eedu%2F&isImage=0&BlockImage=0&rediffng=0>