How to fix an application error on Android?

Question

Android

When launching the flashlight application, the message "Application error!" With the following content: "The Flashlight application (net.cactii.flash2 process) stopped unexpectedly. Please try again."
But that's not all, in the camera application, the back camera menu disappeared, that is, when the application starts, only the front camera opens, without the ability to switch to the back.
Tried to reflash, to no avail. At the expense of a malfunction in terms of the iron of the flashlight and the rear camera, I'm sure everything is in order.
Phone description:
Alcatel OT 990
Android 2.3.7
Tell me what to do?