persistence syntax error always

[Steve2926]

I used

Code:

"persistence_uefi":[
        {
            "image": "/_ISO/LINUX/linuxmint-20.3-cinnamon-64bit.iso",
            "backend":[
                "/_ISO/LINUX/persistence_ext4_256MB_casper-rwCIN.dat"
            ]
        },
        {
            "image": "/_ISO/LINUX/MX-18_x64.iso",
            "backend":[
                "/ventoy/persistence_ext4_256MB_MX-Persist.dat"
            ]
        },
        {
            "image": "/_ISO/LINUX/MX-21_x64.iso",
            "backend":[
                "/ventoy/persistence_ext4_256MB_MX-Persist.dat",
                "/ventoy/persistence_ext4_4GB_MX-Persist.dat"
            ]
        }

and I chose the 4GB persistence file when prompted (xfce version of ISO)
chose first MX-21 x64 boot menu item
entered new password twice
chose 1=Auto
and it booted to Desktop OK
I then saved a new folder on Desktop and rebooted.
The new desktop folder is now present.
So persistence works as far as I can see

I used IdeaPad 300 for test (seemed to get blank screen if used VBOX 5).

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MX-21_February_x64.iso also tested and works.