Unable to login in Themler

Hi,

Please also try it in another browser. Let us know if the problem persists.

Sincerely,
Hella

Hi,

Today is September 30, 2018 and the problem still exists.

I just attempted to log in this morning and was met with the blank login screen. It's "imperative" that I'm able to use Themler. I logged in within Themler.ico, but that's not helping.

I initially attempted to log in through Chrome, which I've been using throughout the design process. When I was met with the blank login screen I logged out of Joomla using Chrome, opened Firefox and tried to open a template but was met with the blank login screen also.

I would appreciate a speedy reply. I'm working from inside my job where I use Themler for the company's new design. This will not go over well.

I tried another site and after clicking on the "Edit Template" to run Themler, I was met with the following in the login screen:

Warning: require_once(/my/site/public_html/administrator/includes/toolbar.php): failed to open stream: No such file or directory in /my/site/public_html/templates/mysite/app/index.php on line 25

Fatal error: require_once(): Failed opening required '/my/site/public_html/administrator/includes/toolbar.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /my/site/public_html/templates/mysite/app/index.php on line 25

Obviously, "mysite" and /my/site/ are changed to protect my site.

Both sites had this after updating to the latest Joomla version.

I logged in to a third site "BEFORE" updating Joomla.
I was able to access that template.

Apparently, the latest Joomla update to 3.9.0 is stopping Themler from accessing the server.

THIS IS CRITICAL!

Themler has not updated the software to work within the newest changes in Joomla.
PLEASE address this quickly!

Thank you.

Last edited 30 October 2018 by tmgarrison

tmgarrison,

Could you please create a new private topic and provide temporary access to your website with Joomla 3.9 for investigation?

Sincerely,
Nettie

I have the same problem. I updatet to Joomla 3.9 and i have a blank white pop up when i will start themler. :-( Please help me !!

i had a Akeeba Backup with joomla 3.8. uff i can work now. But anytime i must update to Joomla 3.9. Not now :-(

Same problem for me with update 3.9 !

Same problem for me with update 3.9 !

Yeh fuck !! Good i don't updated all my Sites. Only one :-O Shit.

Last edited 30 October 2018 by Ivan_Krypt

You can fix the issue for now by copying a toolbar.php file from a Joomla 3.8.13 installation into the ./administrator/includes/ folder.
After doing this you should be able to edit you themler template again.
For your convenience: I have attached the file I have used.

You can fix the issue for now by copying a toolbar.php file from a Joomla 3.8.13 installation into the ./administrator/includes/ folder.
After doing this you should be able to edit you themler template again.
For your convenience: I have attached the file I have used.

Wow thank you very much sibren. I test this tomorrow :-)

This works for me - thank you so much.

Hi,

We're preparing the update with the fix for this issue. It will be available ASAP.
In addition to this, we'll provide an instruction on what php files should be changed in order to start Themler and update it if you already updated Joomla.
As an alternative, you can try the solution provided above but we do not recommend editing joomla core files as it may cause problems inside Joomla unless it is approved by Joomla.
Those who have not yet installed the updated Joomla will just need to update Themler first.

We apologize for the inconvenience.

Sincerely,
Olivia

Hi,

The new update is here!
https://answers.themler.io/questions/173622/themler-hotfix-update-v-472-update-31-oct-2018
If you already updated Joomla to version 3.9 and encountered a problem with launching Themler please follow this instruction and then update Themler.

Sincerely,
Olivia

Hi,

The new update is here!
https://answers.themler.io/questions/173622/themler-hotfix-update-v-472-update-31-oct-2018
If you already updated Joomla to version 3.9 and encountered a problem with launching Themler please follow this instruction and then update Themler.

Sincerely,
Olivia

Thank you very much Oliva !! works now :-) The best support here

Have a nice day !

Having trouble logging into my Themler template – a blank popup appears and disappears without any login option. Any suggestions? I found https://teraboxdl.org/ helpful for managing files.

Last edited 01 August 2025 by alexmorgan.54167

Just like Spotify Premium APK ensures smooth, uninterrupted access to all your music without glitches, your Themler template login issue is disrupting access to the full experience. The blank popup suggests a possible browser cache, plugin conflict, or JavaScript error — fixing these will restore seamless “premium” access to your template, just like resolving Spotify glitches restores uninterrupted streaming. https://spotifypremiumapkk.es/

The login issue you're facing in Themler sounds really frustrating. Sometimes these problems happen due to browser cache or outdated settings, so clearing cache or trying another browser can help.

If you want to explore something different while looking for solutions, you can also check this site for more interesting content.

Sounds frustrating, Frederic — that Themler login popup bug usually happens when the session cache breaks or when Joomla blocks the authentication script. Try clearing your browser cache, disabling any ad-blockers, and temporarily switching your Joomla template to see if the Themler editor loads normally. If nothing works, re-installing Themler or resetting permissions often fixes it.

By the way, if you're testing templates or working long hours, having a solid music setup helps a ton. I use Spotify through a modified build from my site, which removes ads and keeps things smooth while working. If you want to check it out, the Spotify Mod APK website has updated versions you can try.

Hi,

Thanks for taking the time to describe the situation in detail — I know how frustrating this is, especially when you’re working under pressure. The issue you’re seeing is actually a known conflict between Themler and the Joomla 3.9.0 update. Joomla made several changes to core admin folder structures and deprecated some internal files, including references like administrator/includes/toolbar.php, which Themler still relies on. Because Themler hasn’t been updated to match these changes, the login screen fails to load and the editor breaks with the errors you’re seeing.

What this means

Themler is not currently compatible with Joomla 3.9.0.

Any Joomla site updated to 3.9.0 will show a blank login screen or fatal errors when you try to open Themler.

Sites not yet updated (like the third one you tested) continue to work normally because the older file structure is still intact.

Temporary Workarounds

Here are the only reliable options until Themler pushes an update:

Do not update Joomla to 3.9.0 on any project that requires Themler.
Keep the working version (3.8.x or earlier) until Themler confirms compatibility.

If possible, restore the affected sites from a backup taken before the 3.9.0 update.
This will bring back the old folder structure Themler depends on.

If backups aren’t available, you can manually downgrade Joomla, but this is more complex and can cause additional issues unless you’re very familiar with Joomla internals.

Next Steps

Themler’s team must update the editor to address these Joomla changes.

You’re absolutely right: this is a critical issue, and it impacts anyone who relies on Themler for active projects.

We strongly recommend holding off on Joomla updates until Themler provides an official compatibility patch.

You’re not doing anything wrong

The problem isn’t on your end — it’s simply that Joomla moved forward faster than Themler did. Your login attempts, browser changes, and troubleshooting steps were all correct.

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Hi,
The blank popup usually appears when Themler can’t load its login script, often due to browser cache issues or a recent Joomla update. Try clearing your cache, disabling extensions like ad-blockers, or using a different browser. If the issue started after updating Joomla, you may need to reinstall or roll back Themler to restore compatibility.

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Hope this helps!

Thanks for the discussion, this login issue can be really frustrating. In the meantime, if anyone here uses iOS for managing files and backups while working between devices, I’ve found TeraBox For iOS very reliable for secure file storage and easy access across apps. Hope this helps others dealing with related workflow tasks!

Last edited 20 December 2025 by mariaadil070