Error on dashboard page

I’ve got an error on the dashboard page this morning regarding access to certain pages. Then, within an hour (I left for work, didn’t had time to fix it myself), I got onto my laptop and found out that I cannot even access the dashboard anymore. This is the error message that I am getting:

Fatal error: Can’t use the function return value in write context in /home2/ross/public_html/wp-content/plugins/tweet-old-post/includes/admin/class-rop-admin.php on line 893

What might be the cause of this?

The issue is with this plugin "“Tweet old post”.
It seems the plugin is not compatible with PHP version of your hosting provider.

To access the dashboard, FTP into your website files, goes to /home2/ross/public_html/wp-content/plugins and renamed plugin tweet-old-post to tweet-old-post1 . You will be able to access
your website Dashboard.

To fix the error, update your hosting PHP version to latest stable version, either 5.6 or 7.2 or 7.3. It will fix this issue.