Error 500 when click add to favorites

Hi there,
I have enabled the plugin Add to favorites.
It worked perfect in joomla 3.x version but when i upgrade the site in joomla 4 when press add to favorites display the following error:
Error status: 500 , Error text: 

As a results users can not add their favorites items in their list...
May do you have any idea how to fix it? 
Attached a print screen
Thanks in advance!!


 

Hello Can you check tour browser console and put error hère ?
Regards

Hi!
I put the error here from error broswer console:

Refused to apply style from ' altusexplorer.com/media/jui/css/icomoon.css ' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
/index.php?option=com_flexicontent&format=raw&task=ajaxfav&id=94&type=item&lang=el&_=1673167855785:1 Failed to load resource: the server responded with a status of 500 ()
/index.php?option=com_flexicontent&format=raw&task=ajaxfav&id=94&type=item&lang=el&_=1673167855786:1 Failed to load resource: the server responded with a status of 500 ()
%CE%B2%CE%BF%CF%85%CE%BD%CE%AC-%CE%BC%CE%B5-%CF%80%CE%BF%CF%84%CE%AC%CE%BC%CE%B9%CE%B1.html:1 Refused to apply style from ' altusexplorer.com/media/jui/css/icomoon.css ' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.

thanks

thanks we study this
regards

Good morning everyone,
I fix this problem.  I dont know if the problem is a bug of the component, but i restore my web site some previous steps back and i saw that the filed add to favoutites works in the joomla version 4.
Maybe it was a problem comes from a conflict with other extension......?

Thanks you!

very stange need to check more