Latest WordPress 5.3 Update Causing Themler Themes to break

These are the errors that i am getting as a result of the 5.3 update. Themler, please make this compatible with this update.

Warning: Declaration of WP_Export_Theme_Installer_Skin::feedback($string) should be compatible with WP_Upgrader_Skin::feedback($string, ...$args) in /home2/gmmcreative/public_html/demo/virtualoffice/wp-content/themes/drjcprmiami/export/CoreUpdateHelper.php on line 8

Warning: Declaration of WP_Export_Upgrader_Skin::feedback($string) should be compatible with WP_Upgrader_Skin::feedback($string, ...$args) in /home2/gmmcreative/public_html/demo/virtualoffice/wp-content/themes/drjcprmiami/export/CoreUpdateHelper.php on line 39

Warning: Cannot modify header information - headers already sent by (output started at /home2/gmmcreative/public_html/demo/virtualoffice/wp-content/themes/drjcprmiami/export/CoreUpdateHelper.php:8) in /home2/gmmcreative/public_html/demo/virtualoffice/wp-includes/functions.php on line 5946

Warning: Cannot modify header information - headers already sent by (output started at /home2/gmmcreative/public_html/demo/virtualoffice/wp-content/themes/drjcprmiami/export/CoreUpdateHelper.php:8) in /home2/gmmcreative/public_html/demo/virtualoffice/wp-admin/includes/misc.php on line 1252

Warning: Cannot modify header information - headers already sent by (output started at /home2/gmmcreative/public_html/demo/virtualoffice/wp-content/themes/drjcprmiami/export/CoreUpdateHelper.php:8) in /home2/gmmcreative/public_html/demo/virtualoffice/wp-admin/admin-header.php on line 9

Warning: Cannot modify header information - headers already sent by (output started at /home2/gmmcreative/public_html/demo/virtualoffice/wp-content/themes/drjcprmiami/export/CoreUpdateHelper.php:8) in /home2/gmmcreative/public_html/demo/virtualoffice/wp-includes/option.php on line 958

Warning: Cannot modify header information - headers already sent by (output started at /home2/gmmcreative/public_html/demo/virtualoffice/wp-content/themes/drjcprmiami/export/CoreUpdateHelper.php:8) in /home2/gmmcreative/public_html/demo/virtualoffice/wp-includes/option.php on line 959

I have the same problem ... what about it?

I have the same problem in WP 5.3:

"Warning: Declaration of WP_Export_Installer_Skin::feedback($string) should be compatible with WP_Upgrader_Skin::feedback($string, ...$args) in /nfsmnt/hosting2_2/8/5/85ce95be-7844-4b6b-bab5-e2cb97079374/agrispecial.sk/web/wp-content/themes/Agrispecial/export/export.php on line 1009"

export.php line 1009 is:
"class WP_Export_Installer_Skin extends Theme_Installer_Skin {"

What is the problem?

Last edited 13 November 2019 by f.keckes

Yes, equal issues here. WP 5.3. was okay, but upgrading to 5.4 this morning gives the following 2 warnings:

Warning: Declaration of WP_Export_Upgrader_Skin::feedback($string) should be compatible with WP_Upgrader_Skin::feedback($string, ...$args) in /var/www/vhosts/webundprint24.de/httpdocs/webundprint24_website_shop/wp-content/themes/wp24/export/CoreUpdateHelper.php on line 8

Warning: Declaration of WP_Export_Upgrader_Skin::feedback($string) should be compatible with WP_Upgrader_Skin::feedback($string, ...$args) in /var/www/vhosts/webundprint24.de/httpdocs/webundprint24_website_shop/wp-content/themes/wp24/export/CoreUpdateHelper.php on line 39

But theme seems not to be broken.

Did anybody else report this to themler to fix it? Or, am i the only one. My hosting company said they were inundated with calls saying that their themes had broken as a result of this update. Themler needs to fix this.

Hello,

We are sorry for the issue. It should be fixed soon and we will let you know when the fix is available.

Sincerely,
Nettie

Hello,

The update is available now. Please follow the suggestion from this topic:
https://answers.themler.io/questions/193781/themler-v493-beta-compatibility-with-wordpress-5-3

Sincerely,
Nettie

I actually faced this same problem after updating to WordPress 5.3—my Themler-based theme completely broke, and layouts were all over the place. I came to this forum hoping to find help, and after some trial and error, I ended up downgrading for a while just to keep my site wormszoneapks.com running.

I need to understand the possible reasons why a WordPress update would break a theme. WordPress updates can sometimes introduce changes to core functions, deprecated functions curve rush game, or changes in how certain features are handled. Themler is a theme builder, so maybe the way it generates themes relies on functions that have been modified or removed in 5.3.

You're definitely not alone. I also ran into compatibility issues after updating to WordPress 5.3, especially with older or less-maintained themes like Themler. It seems the update changed how certain functions and scripts are handled, which is causing widespread breakage in themes that aren’t regularly updated. On my project beautiful puzzle games, looking for a workaround, rolling back to an earlier version or testing with a staging site might help.

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Yeah, I've run into similar issues after updating to WordPress 5.3 some of my older themes started throwing layout and function errors. It looks like a lot of legacy-coded themes haven't been updated to match the new standards. In the meantime, I've been focusing on client tools outside of WordPress to avoid downtime like using media apps for content demos. If you're taking a break from debugging, check out Castle APK. it’s a solid app for streaming movies. Just make sure to get it from a safe source.

Totally feel your pain—WordPress updates sometimes break more than they fix, especially when themes or plugins aren't well-maintained. I've been dealing with theme conflicts too and needed a break from the chaos. While troubleshooting, I’ve been using Spotify Premium APK to stream music without ads—makes the debugging process a bit more bearable 😅. Worth checking out if you're into music while you work—just be cautious about where you download spotify premium from. and book your service of pest control in islamabad and rawalpindi

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