Attempt to invoke virtual method 'com.hippo.unifile.uniFile[] about flashdex

[az4521]

i'll open issues, but

https://tachiyomi.org/help/guides/troubleshooting/

The Attempt to invoke virtual method' com.hippo.unifile... error can be caused by various reasons, but they all have to do with storage.

Most commonly, it is caused by full storage. Check to see if your device or SD Card is full.
Check if Tachiyomi has access to the SD card. You can enable it in Android settings for app permissions.
If you're downloading and this error pops up, that means the app might not be able to access the folder you're trying to download to. This may be because the folder is corrupted or does not exist. Use a file manager to check that the folder(s) exist and every folder in the sequence is available and accessible.
The drive you're writing to is corrupted. Check using a file manager to see if it is accessible.