"E18" seems to be a code related to and barrel extension problems. Its showing because of lens error or you can say stuck lens. Ok now the question is how its stuck? its happens when the lens not ready for work. Some how its not able to
stable his focus method. That's why its stuck. There is a chances of lens guide pin disturbed or damaged & thats why continues failure. Its mean he inform you there is a system error. So please visit the service center for repair that. Its a very common & repairable problem. Thanks.

Hello there,
The E18 error is related to the LENS not able to retract fully. If it is still under warranty, I would advise you bring it to the nearest service center. This is to avoid further damages. Otherwise, you can try a few things below.
There are a couple of things you can do.
1. Turn it on and then off. Spray canned air around the lens.
If trick 1 will not work out, try this.
2. Make sure the battery is fully charged. Turn on the camera and then give it a couple of firm whacks on the side. Make sure nothing is blocking the lens and wait for it to fully retract.
Let me know how it goes.
If there error has shown up in your camera, sadly, it means you are saddled with a long-standing problem which Canon has not seen fit to properly address.
You may learn much more about the problem and possible fixes at this link:
http://www.e18error.com/posts/index.php
Good Luck!
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