Viewing task logs shows error

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Viewing the scheduled task logs (Site Admin / Server / Task Logs)

Invalid get_string() identifier: 'addtemplateadhoc' or component 'local_email'. Perhaps you are missing $string['addtemplateadhoc'] = ''; in /var/www/vhosts/sandbox.domain.ca/iomad/local/email/lang/en/local_email.php?
line 356 of /lib/classes/string_manager_standard.php: call to debugging()
line 7557 of /lib/moodlelib.php: call to core_string_manager_standard->get_string()
line 41 of /local/email/classes/task/addtemplate.php: call to get_string()
line 307 of /admin/classes/reportbuilder/local/entities/task_log.php: call to local_email\task\addtemplate->get_name()
line 354 of /reportbuilder/classes/local/report/filter.php: call to core_admin\reportbuilder\local\entities\task_log::core_admin\reportbuilder\local\entities\{closure}()
line 39 of /reportbuilder/classes/local/filters/autocomplete.php: call to core_reportbuilder\local\report\filter->get_options()
line 49 of /reportbuilder/classes/local/filters/autocomplete.php: call to core_reportbuilder\local\filters\autocomplete->get_select_options()
line 140 of /reportbuilder/classes/form/filter.php: call to core_reportbuilder\local\filters\autocomplete->setup_form()
line 217 of /lib/formslib.php: call to core_reportbuilder\form\filter->definition()
line 73 of /lib/form/classes/dynamic_form.php: call to moodleform->__construct()
line 116 of /reportbuilder/classes/external/system_report_exporter.php: call to core_form\dynamic_form->__construct()
line 121 of /lib/classes/external/exporter.php: call to core_reportbuilder\external\system_report_exporter->get_other_values()
line 72 of /reportbuilder/classes/output/system_report.php: call to core\external\exporter->export()
line 45 of /reportbuilder/classes/output/renderer.php: call to core_reportbuilder\output\system_report->export_for_template()
line 526 of /lib/outputrenderers.php: call to core_reportbuilder\output\renderer->render_system_report()
line 288 of /reportbuilder/classes/system_report.php: call to plugin_renderer_base->render()
line 67 of /admin/tasklogs.php: call to core_reportbuilder\system_report->output()