Hi Sarah,

as you know from our Support Policy - Joomla issues/bugs are beyond Joomshaper support.

Please ask hosting support to delete current site files (important!) and recover website backup from morning hours or yesterday.

Thank you Paul for your help.

I've followed your advice and restored the website from a backup as suggested. Unfortunately, the issue remains unresolved. The error persists after accessing the administration:

"An error has occurred. 0 Property autocomplete not found in Joomla\Component\Users\Administrator\DataShape\DataShapeObject. Return to Dashboard."

I believe the issue might be related to the activation of Two Factor Authentication in Joomla

regards

Probably, in that case make research on: forum.joomla.org