WordPress goes blank when updating content on page

Try checking your site’s error logs for messages. Your hosts should be able to help you accessing your site’s error logs.

@esmi I talked to the hosts(Domeneshop). They say they dont have an errorlog. Is this something I have to do in WordPress?

All servers have error logs. Not heard of one yet that was configured to not log errors. You need to go back to them and ask them where your domain’s PHP and/or Apache error log is.

In the meantime, you can configure WordPress to log its errors but that won’t include errors occurring at the server level. For that, you really do need the server’s error log. It’s also not recommended that you switch WP logging on indefinitely for security reasons.

@esmi I can try talk to them again, however, they did some tests on my wordpress and I got the codes under up. Maybe that can help?

Notice: Use of undefined constant WPLANG – assumed ‘WPLANG’ in /home/2/f/fuglesangsno/www/wp-content/plugins/LayerSlider/classes/class.km.autoupdate.v3.php on line 74

Notice: Den oppkalte constructor-metoden for WP_Widget i LayerSlider_Widget er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i iPhormWidget er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i iPhormPopupWidget er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i Recent_Post er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i Recent_Port er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i Recent_Port2 er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i Popular_Post er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i contact er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i flickr er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i Twitter er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

Notice: Den oppkalte constructor-metoden for WP_Widget i Goodlayers_Personnal er utg?tt siden versjon 4.3.0! Bruk
__construct()
isteden. in /home/2/f/fuglesangsno/www/wp-includes/functions.php on line 3902

@esmi utg?tt = outdated

@esmi I tried to comment 3902 out with /*, but it made my page crash

Try renaming the wp-content/plugins/LayerSlider folder as there seems to be an issue with that plugin.

If you’re still having problems, try re-uploading all files & folders – except the root wp-config.php & .htaccess files and the wp-content folder – from a fresh download of WordPress. Make sure that you delete the old copies of files & folders before uploading the new ones.