If you encounter the "GnuTLS recv error (-9): A TLS packet with unexpected length was received" message when you try to register a WPML site key on your WordPress blog
You might encounter the following error message when you try to register a WPML site key on your WordPress blog.
In this case, you can resolve this problem by disabling cURL. For this, you can use a WordPress plugin “Core Control”.
Please refer to an article titled "Getting Jetpack to work with WordPress" for more information. It addresses a problem related to JetPack, but the same steps can be applied to this case.
WPML is a premium multilingual plugin for WordPress, which convert WP sites into multilingual sites. Many famous WordPress themes such as AVADA, Enfold, BeTheme and others declare that they are compatible with WPML. It also supports Woocommerce.