Have you tried deleting the contents of the folder - it may be that the permissions set one any one of these may be causing your problems. Of you delete individual folders first, this may point you in the right direction.
What is ransomware and how do I protect my PC from WannaCry?
What I learned from my mentor, Oscar-winning VFX supervisor Phil Tippett
Siri vs Google Assistant
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.