Error 7 while installing Lineageos on Zenfone 2 Z00A

I have tried a first install of Lineageos on an Asus Zenfone 2 Z00A. I have now reformatted all data, done a factory reset and wiped everything but always getting error 7 in zip install. I have twrp-3.0.2-0-Z00A.img, lineage 14.1-20170512-nightly-Z00A-signed.zip and open_gapps-z86-7.1-mini-20170513.zip. How can I overcome this problem?