nexus 6 'encryption interrupted' error

hello everyone, i am posting for the first time here. So i have installed TWRP on nexus 6, i tried installing CM 13 and a couple of other ROMs but i get stuck at 'encryption interrupted' error. i had stock marshmallow rom on it and it was encrypted before started doing all this. I followed the steps listed on a guide on XDA but ended up with this error, at least thats what i think. I am able to flash ROMs, Gapps or anything but it when it boots for the first time, it will stop at this error. Please let me know what i have to do, thank you in advance.

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