Canon E24 error means that there is a loose connection inside the camera, or even a broken (cracked) flexible pcb.
Open the camera up and check all pcb connections, especially to the LCD and to the lens assembly. With the camera open, power it up and wiggle each connector in turn to see the effect, but make absolutely sure not to touch any of the flash circuitry as it can give you a shock and a burn (absolutely do not do this at all if you have a pacemaker fitted). You'll need to have a set of jewellers' screwdrivers and an anti-static wrist strap (properly earthed) whilst doing this. If I've lost you already, then it's not a DIY repair.
I cannot be more specific as you spent no time at all to provide exact model details, nor even a proper question, sorry.
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