Begin of the insertion**Preconditions**

- Timelines module is activated.
- Accessibility mode is enabled.

**Steps to reproduce**

1. Go to Timelines in side navigation.
2. Click on “New timeline report” or “Edit”
3. (Internal error)

**Actual behavior**

- Internal error.

**Expected behavior**

- Form to create / edit timeline report.

**Links to examples**

- [Create timeline report with activated accessibility mode](https://preview.openproject.org/projects/openproject/timelines/new)
- [Edit timeline report with activated acccessility mode](https://preview.openproject.org/projects/openproject/timelines/175/edit)
End of the insertion