Help, can't flash stock LP, stuck on fastboot

i get this error , iam following this guide! http://ift.tt/1Yh5Hrw to downgrade to LP from MM.

All the commands sends out (okay) except this one, and now iam stuck in fastboot.

i had LP 5.1, then updated to 6.0, and unlocked the device now so i can flash the stock LP back..

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