You must have removed the compatibility.zip the wrong way, also not needed with latest bluespark twrp if you already have pie installed.Anyone tried to flash latest 9.0.3 OTA with blu_spark's TWRP 9.91? I have tried and I got zip file is corrupted (tried with and without compatibility.zip). Zip files is not corrupted, I have tested CRC, and it is Ok.
Or the download from the rom is corrupted, check md5 hashes.
Edit: see that you did check the hashes.
Then you removed the compatibility.zip the wrong way, also not needed if on pie and latest twrp