When accessing the next site as a course teacher and going to my home page and clicking the 'Customise this page' button I am seeing the following error message:

The block partners does not define the standard capability block/partners:myaddinstance
line 583 of /blocks/moodleblock.class.php: call to debugging()
line 556 of /blocks/moodleblock.class.php: call to block_base->has_add_block_capability()
line 218 of /lib/blocklib.php: call to block_base->user_can_addto()
line 1923 of /lib/blocklib.php: call to block_manager->get_addable_blocks()
line 1016 of /lib/blocklib.php: call to block_add_block_ui()
line 392 of /lib/outputrenderers.php: call to block_manager->ensure_content_created()
line 45 of /theme/learnmoodle/layout/columns3.php: call to core_renderer->standard_head_html()
line 915 of /lib/outputrenderers.php: call to include()
line 845 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
line 167 of /my/index.php: call to core_renderer->header()