Stuck on Cyanogen Recovery during installation of CM 12.1

hi friends,
I copied the taoshan.zip & gapps.zip to sdcard0
I unlocked the bootloader using the key obtained from sony developer site
then flashed the boot.img in fastboot mode
gave fastboot reboot
then loaded Cyanogen recovery
wiped data/factory reset
then wiped cache partition
the tried apply update from sdcard0
selected taoshan.zip package - during installation its showing message
could not detect filesystem for /dev/block/platform/msm_sdcc.1/by-name/userdata

then installed Gapps also
When finally given reboot, its loading back the cyanogen recovery
--- what to do now, did i miss any steps...
i am uploading the screenshots

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