Dashboard widgets

I've followed the tutorial for creating a dashboard widget in the docs here: https://docs.grabaperch.com/api/dashboard/

I've done everything exactly as described, to the point of downloading the files and using them exactly as they are. Nothing seems to work. If I reload the dashboard nothing appears. The app does display in the sidebar despite setting the variable to false which according to the docs means it wont show up. If I click on the app link in the sidebar I get:

You don't have permission to access /admin/addons/apps/prefix_appname/ on this server.

Any pointers as to how this is supposed to work? I have no PHP errors in the log. The dubug on the dashboard page looks like:

Debug Message - Perch Runway 3.1.1
[1] SELECT u.*, r.* FROM perch2_users u, perch2_user_roles r WHERE u.roleID=r.roleID AND u.userEnabled=1 AND u.userID=1 AND u.userHash='bead7a7a195c78378ef16f41d57e2267' LIMIT 1
UPDATE perch2_users SET userHash='a4a19cd29f294164f3b7a039ed97df76' WHERE userID='1'
[47] SELECT settingID, settingValue, userID FROM perch2_settings WHERE userID=1 OR userID=0 ORDER BY userID ASC
Adding: App name
[17] SELECT itemValue FROM perch2_menu_items WHERE itemType='app'
[nil] SELECT *, REPLACE(pagePath, '/index.php', '') as sortPath FROM perch2_pages WHERE pageNew=1 ORDER BY LENGTH(sortPath)-LENGTH(REPLACE(sortPath, '/', '')) ASC
[16] SELECT p.*, (SELECT COUNT(*) FROM perch2_pages WHERE pageParentID=p.pageID) AS subpages FROM perch2_pages p WHERE p.pageParentID IN (0, 19, 8) ORDER BY p.pageTreePosition ASC
[46] SELECT * FROM perch2_content_regions ORDER BY regionOrder ASC
[4] SELECT * FROM perch2_content_regions WHERE regionPage='*' ORDER BY regionKey ASC
[1] SELECT mi.*, p.privKey FROM perch2_menu_items mi LEFT JOIN perch2_user_privileges p ON mi.privID=p.privID WHERE mi.itemActive=1 AND mi.parentID=0 ORDER BY itemOrder ASC LIMIT 0, 1
[12] SELECT mi.*, p.privKey FROM perch2_menu_items mi LEFT JOIN perch2_user_privileges p ON mi.privID=p.privID WHERE mi.itemActive=1 AND mi.parentID=1 ORDER BY mi.itemOrder ASC
[1] SELECT itemTitle FROM perch2_menu_items WHERE itemType='app' AND itemValue='content' LIMIT 1
[1] SELECT mi.*, p.privKey FROM perch2_menu_items mi LEFT JOIN perch2_user_privileges p ON mi.privID=p.privID WHERE mi.itemActive=1 AND mi.parentID=0 ORDER BY itemOrder ASC LIMIT 1, 10
[2] SELECT mi.*, p.privKey FROM perch2_menu_items mi LEFT JOIN perch2_user_privileges p ON mi.privID=p.privID WHERE mi.itemActive=1 AND mi.parentID=2 ORDER BY mi.itemOrder ASC
File: /core/apps/content/modes/list.post.php
[31] SELECT DISTINCT regionTemplate FROM perch2_content_regions ORDER BY regionTemplate ASC
Queries: 15
Memory: 4.4998