Hi Lap, Sorry for my late reaction. In the meantime I solved the issue. FYI below you find the Apache logfile:
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Tue Nov 08 13:53:02.225523 2016] [:error] [pid 7187] [client 94.209.132.92:52705] PHP Warning: include(/home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/mailchimp-for-wp/includes/class-api.php): failed to open stream: No such file or directory in /home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/wordpress-seo/vendor/composer/ClassLoader52.php on line 186, referer: https://www.kookvakantie.nl/wp-admin/plugins.php
[Tue Nov 08 13:53:02.225635 2016] [:error] [pid 7187] [client 94.209.132.92:52705] PHP Warning: include(): Failed opening ‘/home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/mailchimp-for-wp/includes/class-api.php’ for inclusion (include_path=’.:/usr/local/lib/php’) in /home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/wordpress-seo/vendor/composer/ClassLoader52.php on line 186, referer: https://www.kookvakantie.nl/wp-admin/plugins.php
[Tue Nov 08 13:53:02.225670 2016] [:error] [pid 7187] [client 94.209.132.92:52705] PHP Fatal error: Class ‘MC4WP_API’ not found in /home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/mailchimp-for-wp/includes/functions.php on line 74, referer: https://www.kookvakantie.nl/wp-admin/plugins.php
[Tue Nov 08 13:53:13.454222 2016] [:error] [pid 6952] [client 94.209.132.92:52712] PHP Warning: include(/home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/mailchimp-for-wp/includes/class-api.php): failed to open stream: No such file or directory in /home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/wordpress-seo/vendor/composer/ClassLoader52.php on line 186
[Tue Nov 08 13:53:13.454309 2016] [:error] [pid 6952] [client 94.209.132.92:52712] PHP Warning: include(): Failed opening ‘/home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/mailchimp-for-wp/includes/class-api.php’ for inclusion (include_path=’.:/usr/local/lib/php’) in /home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/wordpress-seo/vendor/composer/ClassLoader52.php on line 186
[Tue Nov 08 13:53:13.454328 2016] [:error] [pid 6952] [client 94.209.132.92:52712] PHP Fatal error: Class ‘MC4WP_API’ not found in /home/kookstudio/domains/kookvakantie.nl/public_html/wp-content/plugins/mailchimp-for-wp/includes/functions.php on line 74
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When I saw these messages I thought there could be something wrong with one of the files. I removed the old version of the plugin and installed release 4.0.7 After that the issue was solved. However I am a bit confused because the update worked fine withe the same installation on another host?
Is there anything special you see in the logfile?
Cheers,
Ger