I fix Prestashop Error "Invalid MailChimp API key supplied"

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What is this Prestashop error "Invalid MailChimp API key supplied"?

I'm on Prestashop Version 1.4 I downloaded the prestashop mailchimp module on malchimp directly for free. I tried to install it via presta but it blocks the module page for me afterwards. So cannot use it and use presta unless I remove it from the module folder. I heard you need to change the "require_once" line on the mc360.php file to "require_once _PS_MODULE_DIR_ . 'mailchimp/MCAPI.class.php';" But ditto it still blocks the module pages, it does not load completely. So if you have a solution so that I can modify or make it work, I take it.
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What is the solution to this Prestashop error "Invalid MailChimp API key supplied"? ?

If you have installed a Mailchimp module for Prestashop and you encounter 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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