Installing e on Pixel 3 ends up with "kInstallDeviceOpenError"

You don’t say what version you are installing and what was on your phone previously, was it a Custom ROM, was it updated to the very latest stock ROM. I will attach some pages I have bookmarked.

https://forum.xda-developers.com/t/fix-solved-status-7-error-with-cwm-or-twrp-recovery-on-rooted-android.2522762/