Error 7 when flashing custom ROM (TWRP) e.g. Omega - Solved

Today I encountered Error 7 when trying to flash a custom ROM. I had Lineage 14.1 prev. and was switching to Omega.

None of the help online helped, so this is for anyone with the same problem. I checked recovery.log.

Issue:
/system in read only mode. Installer cannot create toolbox directory.

Resolution:
Full wipe, including /system. Then my ROM installed. Hope this helps.

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