can not update my lg g2 vs980 to cm12.1 from cm 12

guys i have a problum to update my cm 12 to cm 12.1 and show a error like this please help me in updating
Finding update package....
Opening .....
Verifying.....
Instaling..... G2.verify_trustzone() failend to read current TZ version: -2
E:failed to install /sideload /package.zip