App crashing on startup

[Kleo08s]

Every time i try to open the app it crashes almost instantly.

Using iOS 26.1, signed with a paid developer account with Feather 2.4.0.

Mini vMac-2025-12-01-185048.txt

[zydeco]

The crash seems to be happening here:

minivmac4ios/Mini vMac/DefaultSceneDelegate.swift

Line 58 in a0da18d

AppDelegate.emulator.isRunning = true

This would crash if +[AppDelegate sharedEmulator] returns nil, which will happen if the app's emulator framework is not loaded (due to not being there, or not being correctly signed).
I'm not familiar with Feather, looking at the code it seems to have some options for signing and excluding frameworks. Are all the frameworks present and signed? There should be five, and they should be resigned with the app for installation:

• Mac128K.mnvm
• MacPlus4M.mnvm
• MacII.mnvm
• MacII-512x384.mnvm
• MacII-640x480.mnvm

I have just installed the latest release with AltStore Classic on an iPhone with iOS 26.1, and it works without issues, so it's not a compatibility issue of version 2.6 with iOS 26.1.

[Kleo08s]

oh yeah, on the signing page by default all the frameworks are enabled but strangely after signing and checking again the frameworks they're all disabled, so i guess there's something i'm missing or i need to use a different signer/online signer?

[zydeco]

I'm not sure, I haven't used Feather.
If you have access to a Mac or Windows computer, you can try AltStore Classic.