[Q] help installing ucyan cm 12

yesterday . i downloaded this ucyan cm 12 for my xperia s . and every time when i try to install this rom through CMW and TWRP i get this error



warning: no file_contexts detected filesystem ext4 for /dev/block/mmcblk0p12



and cmw freezes after this error ....



please help .... how to fix this error ?????????????????????????????











P.S : english is not my native language so ignore my mistakes

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