Rename Controller Folder and get error

Need Help
1

I renamed the controller folder in my cake php site to controller_ and got the error.

Screenshot: https://prnt.sc/ho7fce
Error is :

missingAction
className: PagesController
action: index
webroot: /
url: /
base:

I rename back to controllers folder to controllers but the issue is still there. Please help me.
Thanks

2

make sure its ‘Controllers’ with capital ‘C’ in unix systems it matters