Hi there,

Thanks for contacting us. Sorry for the inconvenience. Will you please provide me the Joomla administrator access to check the issue? I will check & get back to you soon. 

-Thanks

I cant go to joomla Admin on website, do u want access to ftp ?

I don't think this is our product issue. Cause, File location doesn't indicate this issue is not related with our product. I see the problem is releated of Joomla. Would you please check with the Joomla template and let me know the update.

File locsation

public_html/sklep.ksturow.eu/libraries/f0f/less/less.php

I know where it is but the problem is that i didnt change anything in your files. Maybe new version of PHP is a problem ?

I think you should rasie a question on Joomla forum. Thanks