I meant does this path exists? /mnt/pve/Frigate_Data/images/104
If its empty "cd mnt/pve/Frigate_Data/images ; rmdir 104".
If contains data, you need to figure out if it is something you want to keep, and if not - delete it.
Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox