Error pages with Groups and Time Slots

The following errors currently happen when trying to edit selected slots in a lab:

• If a student tries to claim a slot while another groupmember already has done so -> Whitelabel Error Page
• If a student tries to open the lab after claiming a slot for their group -> Whitelabel Error Page.
• If I (as manager) try to unenroll a group from their slot -> 'Oops something went wrong' error page.