Hook callback definition contains invalid 'callback' class name in 'local_kopere_recert'. Callback class 'local_kopere_recert\local\hook_callbacks' not found.

line 230 of /lib/classes/hook/manager.php: call to debugging()
line 190 of /lib/classes/hook/manager.php: call to core\hook\manager->is_callback_valid()
line 309 of /lib/classes/hook/manager.php: call to core\hook\manager->getListenersForEvent()
line 310 of /lib/classes/output/core_renderer.php: call to core\hook\manager->dispatch()
line 219 of /lib/mustache/src/Mustache/Context.php: call to core\output\core_renderer->standard_top_of_body_html()
line 138 of /lib/mustache/src/Mustache/Context.php: call to Mustache_Context->findVariableInStack()
line 30 of data/localcache/mustache/1789486430/learnlingo/__Mustache_9d4d5a56c67c28afb2d95abaa0fc5833.php: call to Mustache_Context->findDot()
line 67 of /lib/mustache/src/Mustache/Template.php: call to __Mustache_9d4d5a56c67c28afb2d95abaa0fc5833->renderInternal()
line 192 of /lib/classes/output/renderer_base.php: call to Mustache_Template->render()
line 149 of /theme/learnlingo/layout/drawers.php: call to core\output\renderer_base->render_from_template()
line 972 of /lib/classes/output/core_renderer.php: call to include()
line 888 of /lib/classes/output/core_renderer.php: call to core\output\core_renderer->render_page_layout()
line ? of unknownfile: call to core\output\core_renderer->header()
line 109 of /lib/classes/output/bootstrap_renderer.php: call to call_user_func_array()
line 89 of /local/kopere_pay/classes/shopping/form.php: call to core\output\bootstrap_renderer->__call()
line 125 of /local/kopere_pay/index.php: call to local_kopere_pay\shopping\form->show()