I am getting a lot of these errors when applying a link to a button from / in your advanced custom modules.
Please see images.
I was trying to include a link to a category, in list format
The invalid controller class error ocurred when I tried to do a check-in of all categories in myhiiden Cats menu
aldenbaker
Hi
it seems the link formate is not correct.
Can you provide the module name and ID on which u adding the link and it result this error.
Also share the link URL that u want to add in that specific module button area.
Select Health & Education Reforms
Health & Education Reforms
(Note: Home 1)
section-7 JoomlArt Advanced Custom Module Selected Public 124, I linked it to menu item "index.php?option=com_content&view=category&id=27" which should list the articles in that category. That gave me the 'null' error.
and,
on the Slideshow module:
Slideshow
(Note: Home 1)
slideshow JoomlArt Advanced Custom Module Selected Public 98, I tried to link two buttons to seperate categories. 1: index.php?option=com_content&view=category&id=26, 2: index.php?option=com_content&view=category&id=2. Ninja
aldenbaker
Please check the link you shared is not correct and already giving eror if you paste it in browser.
Kindly copy the link URL from browser instead for example if menu item is Liberty blog you can copy
index.php/blogs/liberty-blog
Wow!!! I changed my php version back to 7.4, and I think it will work. oh my God, what a pain.Ninja
aldenbaker
Hi
I did not understand you last reply as issue was not related PHP as in topic, let me know details if you still need help on this topic.
Always use latest version of extensions and templates.
Yes, I usually do. But some of the other extensions on my site threw out warnings about php 7.4 nearing EOL. So, I upgraded to php 8.0, no luck. then to 8.1, no luck. and back to php 7.4, and everything worked as expected. Thank you for being patient with me. I'm old. 
. Ninja
aldenbaker
There would not be issue for PHP 8.0 stable version
If anything went wrong let me know i will check.
Regards
Would you like access to my hosting cpanel? I noticed that when I switched to php 8.0 and 8.1, the problems began. The links to those categories were not correct with php 8.0 and 8.1. Let me know if cpanel access would help? Ninja
aldenbaker
Yes if you getting issue i can able to check it, let me know details in edit fields options only
I'm trying to figure out how to give you developer access on my a2hosting.com cpanel. Should I email you about this, or Skype?
aldenbaker
You can edit fields in first post or u can send me skype
live:pankajsharma21
