Joomla 4 new template error

paulwiertsema
5 Posts
paulwiertsema posted this 21 November 2022

Hi,
I created a fresh Joomla 4 install and uploaded the Themler file for Joomla 4. When I click edit on the default style, the Themler edit window comes up. I can edit and save the template.

However, when I try to create a new template, or try to import one, I am gettin a error: "Upload failed: Invalid controller, name = 'install', format =''

What is going wrong here?

Hi, I created a fresh Joomla 4 install and uploaded the Themler file for Joomla 4. When I click edit on the default style, the Themler edit window comes up. I can edit and save the template. However, when I try to create a new template, or try to import one, I am gettin a error: "Upload failed: Invalid controller, name = 'install', format ='' What is going wrong here?
joomla-4 joomla-4.4
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Support Team
Support Team posted this 21 November 2022

Hello,

Please try the theme attached. If the issue is still present, please specify your exact Joomla version.

Sincerely,
Nettie

Hello, Please try the theme attached. If the issue is still present, please specify your exact Joomla version. Sincerely, Nettie
joomla4v559.zip
paulwiertsema
5 Posts
paulwiertsema posted this 21 November 2022

No change, I'm afraid.
My Joomla version is : Joomla! 4.2.5 Stable [ Uaminifu ] 8-November-2022 15:00 GMT

No change, I'm afraid. My Joomla version is : Joomla! 4.2.5 Stable [ Uaminifu ] 8-November-2022 15:00 GMT
forpractice374
4 Posts
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jamoya2414
1 Posts
jamoya2414 posted this 25 December 2025

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washerrepairyakima
2 Posts
washerrepairyakima posted this 25 December 2025

This error usually happens due to Joomla permissions or installer restrictions, not Themler itself. When creating or importing a new template, Joomla uses the install controller, and if file permissions, PHP upload limits, or disabled installer plugins are present, it throws the “Invalid controller” error.

Check that:

The Installer – Package Installer plugin is enabled

Your /tmp and /administrator/components/com_installer folders are writable

upload_max_filesize and post_max_size in PHP are high enough

I’ve run into similar issues when working on Joomla sites for appliance repair projects where hosting security rules blocked template installs. Once permissions and installer plugins were fixed, Themler worked as expected.

This error usually happens due to Joomla permissions or installer restrictions, not Themler itself. When creating or importing a new template, Joomla uses the install controller, and if file permissions, PHP upload limits, or disabled installer plugins are present, it throws the “Invalid controller” error. Check that: The Installer – Package Installer plugin is enabled Your /tmp and /administrator/components/com_installer folders are writable upload_max_filesize and post_max_size in PHP are high enough I’ve run into similar issues when working on Joomla sites for [appliance repair][1] projects where hosting security rules blocked template installs. Once permissions and installer plugins were fixed, Themler worked as expected. [1]: https://washerrepairyakima.com/
janiecarmody
35 Posts
janiecarmody posted this 3 weeks ago

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Running into setup errors can really slow things down, especially when you’re trying to move forward without extra hassle. From a user point of view, it helps when the issue is broken down step by step and fixed without confusion. I’ve had similar moments where clear problem handling mattered just as much as the solution itself, like when dealing with [electrical contractors bergen county nj][1] for unexpected issues. Having someone who stays patient and explains what’s happening makes the whole experience smoother and less stressful. [1]: https://enaranj.com/
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