How to find the cause of a problem on Prestashop ?

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The answer in detail: determine the cause of the Prestashop bug problem

There are simple methods to identify the cause of a glitch on the Prestashop store and help you fix the problem faster. You have probably faced issues like left column or footer not appearing in future or list of modules on back-office disappearing. The first step to fix the problem is determine the reason behind the problem.
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Step 1: Activate the display of bugs and errors on Prestashop

Go to the store configuration folder and then open the file called config.inc.php. These lines should be replaced: @ini_set('display_errors', 'off'); define('_PS_DEBUG_SQL_', false); In these sentences: @ini_set('display_errors', 'on'); define('_PS_DEBUG_SQL_', true); error_reporting(E_ALL | E_STRICT); Save the file and then refresh the page to resolve the issue. An error message will be displayed, describing exactly what went wrong. Be sure to replace the first few lines of this file once the issue is resolved.
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Step 2: Test the template (site model) and installed modules

To determine if the problem is caused by your template, activate the default Prestashop template and then refresh the page that caused the problem. If the bug continues to occur, it is a sign that it is not caused by your model. To determine if the problem is the result of the module you are using, disable one module at a time that you are using and refresh the page that is causing the problem each time. Start with the modules you installed last, if the problem appeared abruptly. If the problem does not appear after disabling a module, it is likely caused by that module. Once you identify where the problem is and identify the root of the problem, chances are you can fix it yourself. If you are having trouble locating the source of the problem, this will allow you to contact the right person and provide them with the necessary information. If your model is causing the problem, all you have to do is contact the creator and provide them with the error message you are seeing and they will be able to take action quickly and efficiently.
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What is a Prestashop problem ?

A problem is a Prestashop error that results in the malfunction of a single or global part of the device. By error, we mean that the Prestashop software or device is not able to perform the expected actions, and is then forced to take an unexpected path. It can impact the Prestashop program, but also a hardware device such as a computer. This error causes a Prestashop system crash which can even lead to a complete shutdown to restart. When a problem occurs, web developers can fix it by applying a patch. In fact, fixing Prestashop related issues is an integral part of their mission.
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