In order to learn how to write a plugin, I installed the Kitchen sink plugin: https://github.com/bywatersolutions/koha-plugin-kitchen-sink into stock Koha 17.05. When I ran the plugin's report tool, I got this error: Undefined subroutine &Koha::Plugin::Com::ByWaterSolutions::KitchenSink::GetBranchName called at /var/lib/koha/rpl/plugins/Koha/Plugin/Com/ByWaterSolutions/KitchenSink.pm line 372. The code in question is this: $template->param( date_ran => dt_from_string(), results_loop => \@results, branch => GetBranchName($branch), ); After poking around in the Koha git repository, I saw that GetBranchName was removed by this commit: commit 19a977dc7b779173c4a3e96b6b06dc35db663601 Author: Jonathan Druart <jonathan.druart@bugs.koha-community.org> Date: Tue Feb 2 17:28:30 2016 +0000 Bug 15758: Koha::Libraries - Remove GetBranchName I was able to fix the plugin by replacing the line with the GetBranchName call with this line: branch => Koha::Libraries->find($branch)->branchname,