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I’ve found an incompatibility between WPML and Rankmath in the latest WP version (5.3) with both plugins latest versions over PHP 7.1 (not tested over other PHP versions or other WPML/ Rankmath/WP versions)
When both plugins are active at the same time an error appears in the apache2 log:
PHP Warning: ftp_nlist() expects parameter 1 to be resource, null given
PHP Warning: ftp_pwd() expects parameter 1 to be resource, null givenHow this affect?
When I go to Rankmath->General Settings-> Edit .htaccess if WPML Multilingual CMS plugin is activated an error appears:.htaccess file not found.
But if I disable WPML then that error goes away. Same happens with the Apache error log. As soon as I disable WPML the PHP Warnings go away. For some reason there seems to be an incompatibility with the WP_Filesystem class and the methods of this class (get_contents returns null), @ file /seo-by-rank-math/includes/admin/class-admin-helper-php
EXTRA:
Also happens exactly the same if I activate Accelerated Mobile Pages plugin (AMP for WP).
Maybe this could be more helpful than WPML, because it’s a free plugin for testing purposes.
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