autotutorial

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Maybe Yoast Seo plugin have conflict with theme or plugin.

Save for database

When using a non-default language the url is not found, you have Spanish as the default while if you use the English language is added en / to the url this produces an error http 404, ask for support to your multilingual plugin
https://wpml.org/purchase/support-policy/

• This reply was modified 6 years, 6 months ago by autotutorial. Reason: Edit, problem multi language

https://wordpress.org/support/topic/warning-message-115/#post-12134170
are you two to receive the same error, have you installed wordpress via some loader?

https://github.com/WordPress/WordPress/blob/5.3-branch/wp-includes/class-wp-post-type.php#L526
Foreach only works with arrays and objects.
may be a conflict of themes or pligin, set the default theme twenty * and disable your plugins, if this does not solve the problem you can check your php error log.

Add this constant into wp-config.php before require_once

//Without and slash
define('WP_HOME', 'http://your domain.com');
define('WP_SITEURL', 'http://your domain.com');

If you still can’t access it means that one or more of the following temporary problems is using a load balancer and / or a cache. Contact your hosting if you have never added this.

I ask you for this information to create htaccess and the constants in wp-config.php right

SITE_ID_CURRENT_SITE (normally its value is 1 because currently WordPress does not allow you to create more than one network) is reference of network and BLOG_ID_CURRENT_SITE is your id blog always referring to the network (1 for primary site , first secondary site)
https://developer.wordpress.org/reference/functions/ms_load_current_site_and_network/

Multisite subdirectory on wpsamp
these constants are all for network (never for secondary sites or the first primary site that is the first secondary site)
do you have all these constants in your network? has the network been defined?
if both answers are true, that’s enough
define('COOKIE_DOMAIN', $_SERVER['HTTP_HOST']);
define('COOKIE_DOMAIN', '');
blog_id to zero is right on a non-existent domain while if the domain exists it is always different from zero.
Network -> domain.tld
Multisite on subdirectory -> domain.tld/ns1 (seconday site with >= id 2)
Or
Multisite on subdomain -> ns1.domain.tld (secondary site with >= id 2)
Domain mapping (for network domain.tld) -> any.domain.com
I search any.domain.com WordPress start connection with domain.tld/ns1 or ns1.domain.tld after any.domain. com
if the secondary site is archived the mapping should never be taken into consideration, at least this is what I understand.
Please you can share your constant multisite (network) wp-config.php?

@lahiru if the first installation is started before wordpress 3.5 and in the case of a multisite wp-content it also has a blog_dir folder inside it. In wp-content there is the theme directory, plugin initially but other plugins can create other folders.
I hope you read the entire article I entered, from wordpress 3.7 you can always update to the latest version otherwise you manually update every two minor ones for example 3.4 3.4.2 etx.

@bunnylake if you do the manual update you always work, it depends on the type of error you find I suppose your wp-includes folder was not writable (it is a hosting problem not of wordpress).
You have to read the extended update obviously you need to have a working backup, you don’t have to delete the wp-content wp-config.php etc .. this process is described in the extended update link.