no system partition in realme c11

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hey guys! i recently unlocked the bootloader of my realme c11 to flash lineage os 17 . so to do so i installed twrp recovery and there i accidently wiped my system partition .from then on i cant mount my system and vendor partition in twrp and i'm stuck now cause nor i have any os installed , so after that there remained the option to flash oppo stock firmware image using fastboot , with fastboot i flashed boot.img successfully but when i tried to flash system.img using "fastboot flash system system.img" it said that there is no such partition as system. i mean why ......why does it happen why can't i flash system even with fastboot guys anyone who can help is gladly appreciated ,it'll be very nice of you . itll be great if anybody provide a straightforward answer to this......i'm counting on you guys........i'm on the verge of giving up//,/.;'.,//.;