Fastboot showing (remote: unknown command)

[akshapatil]

I tried installing CMW on my Yu Yureka plus and endup with bricking the phone. now phone is in bootloop. I connected the device in fastboot mode to pc. Fastboot device recognises the device. But when i tried to use oem unlock and flsh command it gives error like this
C:\Program Files (x86)\Minimal ADB and Fastboot>fastboot flash recovery TWRP.img
target reported max download size of 268435456 bytes
sending 'recovery' (19698 KB)...
OKAY [ 0.655s]
writing 'recovery'...
FAILED (remote: unknown command)
finished. total time: 0.671s

any help on this please.