"No reader engine for this file or invalid file" when trying to open epub files after installing Assistant

[caidep]

All of my unread epub files became suddenly un-openable after I installed the Assistant plugin. The only epubs I could open were the ones I had previously read/am currently reading. When I tap on an unread epub, the "No reader engine for this file or invalid file." message pops up and the epub does not open. Issue goes away when I turn off the Assistant plugin in through Top Menu / Wrench icon / More tools / Plugin management / uncheck Assistant. Can confirm that the unread epubs had no problems opening before I installed Assistant and when Assistant is turned off.

The plugin itself was installed according to instructions and works perfectly in epubs that I can open.

assistant.koplugin version: v1.05
KOReader version: 2025.04 (koreader-android-arm64-v2025.04.apk)
Device: Onyx BOOX Page (build number 2025-06-17_20-04_4.0.2_rel0617_d4b9d37036)

Issue does not show up on crash.log.

How to reproduce (if relevant):

1. Install assistant.koplugin to KOReader
2. Open any unread epub
3. See "No reader engine for this file or invalid file." message

[boypt]

how about the latest code in the repo ? (click Code button, Download ZIP)

there was a bug in the recap function while hooking the reader while opening a file, fixed in #53 .

I encountered this before but didn't realize it's the plugin problem, but now using the latest code I cannot reproduced the problem.

[caidep]

Using the latest version instead of the stable release works! Should've tried this first. Thanks for the help!