I fix Prestashop Mailchimp bug "Fatal error: Call to undefined method Language"

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What is this Prestashop Mailchimp "Fatal error: Call to undefined method Language" bug?

I am trying to import mailchimp module on my 1.6. Impossible, here is what I get: Fatal error: Call to undefined method Language::getIDs() in /home/xxxxx/www/modules/mailchimppro/src/PrestaChamps/PrestaShop/Tab/TabInstaller.php on line 54 [PrestaShop ] Fatal error in module TabInstaller: Call to undefined method Language::getIDs() What can I do to make this work? I am currently using PrestaShop 1.6. This particular version did not have the getIDs() function in the /classes/Language.php file. I went to the PrestaShop github repository and looked at version 1.6.1.1. I found the missing function, and did the following: Open cPanel's file manager. Go to the classes/Language.php file. Create a backup! Edit the file. Find the getLanguages function. Mine was at line 578. Save the file and replace this function with the following. Reinstall the program.
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What is the solution to Prestashop Mailchimp bug "Fatal error: Call to undefined method Language"?

If you have installed a Mailchimp module for Prestashop and you are having a technical problem, Web2007 can assist you and troubleshoot. You should know that in almost all cases, the module works perfectly, the server or php error comes from a conflict with your theme or one of your other installed modules. A troubleshooting expert will first detect errors with Prestashop's debug mode. Here are the tips: To determine if the bug is due to your template, activate the default Prestashop template and then refresh the page. If the bug persists, it means that your model is not at fault. To determine if the bug is caused by one of your modules, disable each module and refresh the page that caused the problem. If the bug appears suddenly, you can start with the modules that were installed most recently. If the bug goes away when you disable a module, that means that module is responsible.
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