can't flash

I:Get_Max_FileSize::maxFileSize: 17592186044416
I:sending message to add 65537 '/data/media/0' 'Internal Storage'
I:Message sent, add storage ID: 65537
MTP Enabled
I:Switching packages (TWRP)
I:Skipping screen timeout: TW_NO_SCREEN_TIMEOUT is set
created new mtpserver object
MtpServer::run fd: 47
mtppipe add storage 65537 '/data/media/0'
MtpStorage id: 65537 path: /data/media/0
I:Set page: 'install'
I:Set page: 'flash_confirm'
I:Set page: 'flash_zip'
I:operation_start: 'Flashing'
Installing '/sdcard/cmupdater/cm-12.1-20150804-NIGHTLY-d800.zip'...
Checking for MD5 file...
Skipping MD5 check: no MD5 file found
I:Zip contains SELinux file_contexts file in its root. Extracting to /file_contexts
I:Legacy property environment initialized.
Comparing TZ version TZ.BF.2.0-2.0.0086 to TZ.BF.2.0-2.0.0078E
Comparing TZ version TZ.BF.2.0-2.0.0091 to TZ.BF.2.0-2.0.0078E
script aborted: assert failed: g2.verify_trustzone("TZ.BF.2.0-2.0.0086","TZ.BF.2.0-2.0.0091") == "1"
assert failed: g2.verify_trustzone("TZ.BF.2.0-2.0.0086","TZ.BF.2.0-2.0.0091") == "1"
I:Legacy property environment disabled.
E:Error executing updater binary in zip '/sdcard/cmupdater/cm-12.1-20150804-NIGHTLY-d800.zip'
Error flashing zip '/sdcard/cmupdater/cm-12.1-20150804-NIGHTLY-d800.zip'
Updating partition details...
I:Data backup size is 5810MB, free: 1353MB.
I:Unable to mount '/usb-otg'
I:Actual block device: '', current file system: 'vfat'
...done
I:Set page: 'flash_done'
I:operation_end - status=1
I:Set page: 'clear_vars'