Gabor

Hi @wpguy2098!

Output buffer errors usually happen, when there is another PHP error on the website. The way output buffering works is, that there cannot be any content returned until the buffer ends. A PHP error stops the codes of the website and writes out some error message, which happens before the buffer end, causing the buffer error message too. So that error message should be found. You should turn on error reporting on your website this way:
https://smartslider.helpscoutdocs.com/article/1949-error-reporting#error-report-wp
When the error happens again, this should produce a “php-error.log” file in the root folder of your WordPress installation. Please send us that log to support@nextendweb.com and from it we will try to figure out what causes this issue!

When user permissions are correct, then the server’s object caching or query caching causes the issue. In the connected code:
wp-content\plugins\nextend-smart-slider3-pro\Nextend\SmartSlider3\Install\Tables.php
for example if we watch what happens with “application_2” index:

self::dropIndex('#__nextend2_section_storage', 'application_2');
....
$this->query("ALTER TABLE #__nextend2_section_storage ADD INDEX application_2 (application, section(50))");

with a wrong server cache the following happens:

1. The first line removes the index from the database.
2. For the “ALTER TABLE” code, a caching layer (like Redis, Memcached, or MySQL query cache) returns an old cached version of the table metadata. This is why even though “application_2” was dropped, the next codelines don’t receive an accurate information about it.
3. As a result, a “Duplicate key” error appears for the “application_2” index.

From the code’s perspective, it is not possible to tell if the server is returning outdated table metadata due to object or query caching, or we are getting a real result, when an error happens, so there is no patch we could create for these kind of problems. That is why this can only be solved by adjusting the configuration of the server, to for example disable every server cache, or to debug the cache and modify its settings.

Executing the statements manually works out, because in phpMyAdmin there is no such caching.

You should also note, that your databases won’t go wrong, even if the update for some reason stopped halfway. Once the update is properly able to run, that fixes all issues, and that is how repairing would happen.

Now I have updated our documentation to include the structure and indexes of all our database tables:
https://smartslider.helpscoutdocs.com/article/1956-all-folder-file-and-database-table-created-by-smart-slider#Structure-and-indexes-_bsjM

If your database tables are fine, then you are being stuck in the install phase, as that won’t be completed until the database codes are able to run. Manually you can modify the following file:
wp-content\plugins\nextend-smart-slider3-pro\Nextend\SmartSlider3\Install\Install.php
to delete this line:

$tables->install();

and then if the the database is truly fine, your Smart Slider should work. But as you can tell too, this is just a temporary solution for the current version, and with the next version the same issue will happen, until the caching problem won’t get fixed on the server.

Alternatively, I can also suggest creating a copy of your websites on localhost, like on Xampp or Wamp server. There with the default setups of these localhost servers, you won’t have this problem, and you can either just copy back the updated website to its original placement, or compare these proper environments with the live server’s, to figure out what is different.

If your user does really have ALTER and DROP permissions, then the problem will be caused by server cache, that your server still serves an older version of your database.

So somehow the database modifications did not happen in your case due to some server limitation or the modifications did happen, but the new database does not load.

Are you managing your own server, or are you using the services of a hosting company? The person that has access to the server’s configuration, could open this PHP file to see the exact codes, which are running:
wp-content\plugins\nextend-smart-slider3-pro\Nextend\SmartSlider3\Install\Tables.php
The install() function runs the database modifications, through the functions that can be found lower in that file. If you have errors, like:

Duplicate key name 'application'

then you can see in that file, that in a proper environment this couldn’t happen, because we are dropping the ‘application’ index before trying to create another one:

        self::dropIndex('#__nextend2_section_storage', 'application');
	...
        $this->query("ALTER TABLE #__nextend2_section_storage ADD INDEX application (application, section(50), referencekey(50))");
        ...
private static function dropIndex($tableName, $colName) {
        ...
            Database::query("ALTER TABLE " . $tableName . " DROP INDEX " . $colName . "");
        ...
    }

So in this example the ALTER TABLE … DROP INDEX code couldn’t run due to a server issue. This file can be used to see what should be happening on the server.

Hi @sooskriszta!

I’m sorry, but we don’t have an option like that. There are two reasons, why we aren’t offering this kind of option:

1. Our system is device width based. For example on desktop computer if you make your window narrow and load your page, the slider won’t show up as it is mobile view, but if you make the screen wider, it will appear. For this, you need to have the code on the page.
2. Full page caches are usually only storing one cache for one page. So if you have a caching plugin or server cache on your website, and take a look at your website on mobile, where our code is missing, the website’s cache will be generated by the cache plugin/server there. After that if you visit the website on desktop computer, that cache plugin/server will load the mobile stored cache, so our code will still be missing.
   Of course there are some caches, which offer device based caching, but due to the really common issues we expienced with the single caches, we do not have support for these either.

So right now the most optmized option we offer is in the Pro version with Size tab -> Hide on:
https://smartslider.helpscoutdocs.com/article/1980-how-to-hide-the-slider-on-mobile#hide-pro
where we are loading as few codes as possible (images aren’t loading, which is the most important in speed), while we do load some codes.

Hi @halleeb!

We haven’t heard about any issues related to new WP versions. Could you tell me what is the error message you see?

The most common installation issues:

1. If you see “unzip_first” in the name of the zip file, you have to unzip it, and the inner zip file can be installed:
   https://smartslider.helpscoutdocs.com/article/1717-wordpress-installation#step-2
2. In case you see “The uploaded file exceeds the upload_max_filesize directive in php.ini.”, then the server’s configuration has to be adjusted:
   https://smartslider.helpscoutdocs.com/article/1717-wordpress-installation#uploadmax

Hi @mstudioil!

I’m sorry, but we don’t have an option to add special transition between slides that have videos. So the ‘Main animation’ of the slider could affect:
https://smartslider.helpscoutdocs.com/article/1779-slider-settings-animations
how the slide switching happens in this case, which could be sliding or fading.

To have self-hosted videos, is a Pro version option, where the video could be background:
https://smartslider.helpscoutdocs.com/article/1924-how-to-add-a-video#slidebg
or layer:
https://smartslider.helpscoutdocs.com/article/1924-how-to-add-a-video#layers
In the Free version Youtube or Vimeo layers can be used, but those won’t cover the slides at any given responsive case. Background videos are autoplaying automatically (where they can), and layers have autoplay options too.

If you would have a question about the Pro version features, please get in touch with us here:
https://smartslider3.com/contact-us/support/
as this forum only allows the Free version to be supported.

Hi @alquimia!

By default Nextend Social Login uses the the /wp-login.php page to handle the login and registration flow. When it is not accessible then you need to create custom pages for Nextend Social Login to handle the login flow.

First create an empty page what you will not use for anything else, then at Global Settings -> General tab:
https://social-login.nextendweb.com/documentation/settings/general-settings/
you should use the “OAuth redirect uri proxy page” setting. This means that our plugin will no longer use the /wp-login.php page for the API connection, but the custom page you created and selected here. At the API settings you made for Google:
https://social-login.nextendweb.com/documentation/providers/google/#configuration
you have to change the step 22. setting, to change the URL for the API. This also changes the URL on the social login button. I suggest checking the steps on your own admin area, as that will display the exact url you have to use at this step.

Then create another new page again, and also at the Global settings:
https://social-login.nextendweb.com/documentation/settings/general-settings/
you will find a “Page for register flow” setting. To the new page’s description you should add the given shortcode, [nextend_social_login_register_flow]  . Then select that page with our settings. This page will be used to ask “custom data”, such as an email address from the users who register with Nextend Social Login.

If something won’t work out, let us know!