cant use swapfiles as a writeback device

[dragon-Elec]

ray@ray-X450CA:~/Desktop/Link to z-manager$ sudo python3 test_writeback.py set zram0 /swapfile
--> Ensuring writeback device for zram0 is set to /swapfile...

--- Actions Taken ---
❌ validate-writeback-device: /swapfile is not a block device

...Overall Failure: validation failed
ray@ray-X450CA:~/Desktop/Link to z-manager$