###

### Steps to reproduce

1. Login and open a projects/Calendars

2. On the calendars index page, click on the bin to delete a calendar


### What is the buggy behavior?

* Error 404 and the blank page


<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/799709/content">

### What is the expected behavior?

1. Index page should show as on prod (16.5)


### Note

Begin of the insertionThere wereEnd of the insertion Begin of the deletion This isEnd of the deletion also Begin of the insertionproblems with the following cases. They should all be fixed as well, but I don&#39;t know how reproducible the errors are from the UI. Observing the network tab should help.

1\. Jira Import Instance (/admin/import/jira/instances)
&nbsp;- Go to Administration → Import → Jira
 - Add a Jira instance
 - Delete it (but I&#39;m not sure if that&#39;s possible from the UI, at least I couldn&#39;t find the delete button)

 2. Enumerations (/admin/enumerations)
 - Go to Administration → Work package priorities
 - Delete a priority

 3. Forums (/projects/:id/forums)
 - Go to a project → Forums
 - Delete a forum

 4. Roles (/roles)
 - Go to Administration → Roles and permissions
 - Delete a role

 5. Boards (/projects/:id/boards
 - Go to a project → Boards
 - Delete a board

 6. Cost log (/cost\_entries/:id)
 - Log a cost entryEnd of the insertion Begin of the deletion happeningEnd of the deletion on Begin of the insertiona work package
 - Delete it from the work package view
 - Delete it from the Cost Reports view

 7. Deploy Targets (/deploy\_targets)
 - Go to Administration → GitHub → Deploy targets
 - Delete a deploy target

 8. LDAP Groups Synchronized Filters (/ldap\_groups/synchronized\_groups)
 - Go to Administration → LDAP groups → Synchronized filters
 - Delete a filter

 9. File Storages (/admin/settings/storages)
 - Go to Administration → File storages
 - Delete a storage

 10. Team Planner (/projects/:id/team\_planners)
 - Go to a project → Team Planner
 - Delete aEnd of the insertion team Begin of the insertionplanner viewEnd of the insertion Begin of the deletion planners, boards, rolesEnd of the deletion

### Environment information

**OpenProject version**

_16.6.0_

**Browser**

* [x] Chrome
* [ ] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [ ] Windows
* [ ] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [x] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)