persistence syntax error always

[Schrotty]

I get always whene i boot MX Linux with persistence a Syntax Error but i can not read, it disappears too fast.
i have make with VentoyPlugson but i dont knwo why not work.

"persistence_uefi":[
        {
            "image": "/MX-21.iso",
            "backend":[
                "/persistence/persistence_ext4_4GB_MX-Persist.dat"
            ],
            "autosel": 1
        }