Plugin could not be activated because it triggered a fatal error - wordpress

I am Using MyMail - Email Newsletter Plugin for WordPress
MyMail - Email Newsletter Plugin for WordPress :::: advanced Newsletter Plugin for WordPress. Create, Send and Track your Newsletter Campaigns
Version 1.6.6.1 | By revaxar
When I try to activate this plugin i got an Fatal Error (Plugin could not be activated because it triggered a fatal error.)
as in
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http://codecanyon.net/item/mymail-email-newsletter-plugin-for-wordpress/3078294/comments?page=24
Discussion on MyMail - Email Newsletter Plugin for WordPress
please open the wp-content/plugins/myMail/classes/templates.class.php
and remove this line around #657:
$this->copy_templates()
and try again
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i tried a lot like PHP version related issue and all but could't get any proper solution to resolve it
Plugin produces fatal error when attempting to activate .The big question I have now is this: What is the cause of this fatal error and how can I fix it? Can someone help me interpret so I can begin to see how I might overcome these fatal errors?

Please try to update your wordpress version and that plugin version usually this problem occurs when plugin was coded for previously developed wordpress. there may be the compatibility issue in wordpress and plugin.

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I have installed Buddyboss and Elementor both the plugins and activated, could not face any issues. Could you please change the theme and try again? It may sometimes caused by the activated theme. I suggest you to switch to default WordPress theme(twenty twenty two) and check. Another thing can be caused by the PHP version, please check your PHP version, I am using PHP 8+ and it is perfectly working.
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i think is a problem of plugin's compatibility in your site.
Have you try to update wordpress core, plugin and theme?
if after update all you have the same problem is an compatibility issue.
Let me know.

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