PHP Warning: call_user_func() expects parameter 1 to be a valid callback

Hello Yurii,

Please, try re-exporting the theme from Themler desktop and reinstall.

Gina
Themler support

I followed your recommendation, but it didn't help.
I can give you administrative rights to the site

Attached template.

Last edited 26 October 2020 by chinas

Your theme is version 499, I have exported from version 517 and attached. Could you please test it?

Gina
Themler Support

I installed the template you suggested. It didn't help, I get the same error.

This issue is forwarded to the developers. Meanwhile, you can try this:

1) Disable PHP warnings in Joomla. They are not affecting any functionality (if we are talking about warnings, not errors; in your case it is a warning),

2) Try changing that line of code to call_user_func(array($styles[$style], $module, $params, $attribs));
But please make sure you make the backup of the correct file so in case of an error, you could replace that file on the server.

Gina
Themler support

1. I cannot ignore the error. Due to an error, part of the site's functionality does not work.
2. I tried to replace the code snippet. It got worse, all modules were no longer displayed.

I can send a backup of the WEB-site, if necessary.

Last edited 27 October 2020 by chinas

Could you please describe what functionality doesn't work?

Gina
Themler Support

Module "Custom Filters" (https://extensions.joomla.org/extension/custom-filters-pro/) for VirtueMart does not work. When trying to filter a product by the selected parameters, the error mentioned above occurs and the display of the module disappears.
The module works with other templates without problems.
https://demo.breakdesigns.net/index.php/search/screens/

Last edited 29 October 2020 by chinas

Unfortunately, I can't fix incompatibility with 3rd party plugins.
I will forward this issue to the developers.

Gina
Themler support

Let me know how the results will be from the developers.

Can you recommend a module for filtering products by custom fields that will be compatible with your template?

I have already tried several different product filters from different manufacturers. They all have the same compatibility issue with your templates. The same error is always returned.
I can provide all the necessary access to my WEB-site.

The error message you're encountering, "PHP Warning: call_user_func() expects parameter 1 to be a valid callback," suggests that there's an issue with the callback function being passed in your code. Specifically, the $styles variable seems to be empty, resulting in the error. To resolve this, ensure that the $styles variable is properly initialized with valid callback functions. If you're looking to train for a career in hotel administration, addressing and debugging such technical challenges can be valuable in enhancing your problem-solving skills, which are essential in managing various aspects of a hotel's operations.

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