Launch the app on your jailbroken device.
You installed a legacy tweak that hooks into UIKit incorrectly. Fix: Boot into Safe Mode (Volume Up + Volume Down + Power) and uninstall the conflicting tweak from Cydia. cydia installer repo sileo
The most reliable method to get Cydia Installer on a Sileo device is through a third-party repository maintained by a developer known as Diatrus. While Sileo can run Cydia tweaks, the actual Cydia application itself is not available in Sileo's default sources. Launch the app on your jailbroken device