Hello,
I have a problem when I tried to unpublished a website item, i got this error,
Server Error
PermissionError: [Errno 13] Permission denied: ‘/opt/bitnami/erpnext/frappe-bench/sites/erpnext/indexes/web_routes/MAIN_WRITELOCK’
My current versions
ERPNext: v13.13.0 (version-13)
Frappe Framework: v13.13.0 (version-13)
Is there anything Do I need to do ?
Thanks you
The issue is not with the version its with the file permission.
I faced same issue and had a very simple approach to resolve it:
download WINSCP ( for windows to Linux file directory manager(FTP)) : link
just go to the directory up till - /opt/bitnami/erpnext/frappe-bench/sites/erpnext/indexes/web_routes/ the right click on the folder via SCP
and try giving all the permssion just like i did 

Voila! It will work !
Sorry forgot veru important thing:

Select this option while giving permission rights