TWRP, les processus d'Updater se sont terminés par ERROR : 7

Chaque fois que j'essaie de flasher Lineage OS avec TWRP v 3.2.1-0, j'obtiens

Updater processes ended with ERROR: 7
Error installing zip file '/sdcard/...n1awifi-signed.zip

Quand je vérifie mon recovery.log

Skipping Digest check: no Digest file found
I:Update binary zip
I:Zip does not contain SELinux file_contexts file in its root.
I:has_legacy_properties: Found legacy property match!
I:Legacy property environment initialized.
Target: samsung/lt03wifiue/lt03wifiue:5.1.1/LMY47X/P600UEUDOK1:user/release-keys
Target: samsung/lt03wifiue/lt03wifiue:5.1.1/LMY47X/P600UEUDOK1:user/release-keys
detected filesystem ext4 for /dev/block/platform/dw_mmc.0/by-name/SYSTEM
detected filesystem ext4 for /dev/block/platform/dw_mmc.0/by-name/SYSTEM
about to run program [/tmp/install/bin/backuptool.sh] with 2 args
Not backing up files from incompatible version: 14.1
run_program: child exited with status 127
about to run program [/tmp/install/bin/otasigcheck.sh] with 1 args
You have an installed system that isn't signed with this build's key, aborting...
run_program: child exited with status 124
script aborted: Can't install this package on top of incompatible data. Please try another package or run a factory reset
Can't install this package on top of incompatible data. Please try another package or run a factory reset
Updater process ended with ERROR: 7

Comment résoudre cette erreur J'ai validé que mon TWRP et ma rom (que j'essaie de flasher) correspondent à mon architecture (selon le numéro de modèle et le résultat de /proc/cpuinfo )