" Validation (HTML5): Element 'a' must not be nested within element 'a button' "
You cannot have one anchor tag inside another anchor tag. If you have it that will cause you the problem.
Check out this thread to find out valid elements which can be nested inside an Anchor tag.
I had no permisson to view.
You need to give proper read/write permissions for the ApplicationPool Identity on the folder structure you have for your website. Or else IIS Apppool will not be able to get the files and execute them.
Give permissions to AppPool Identity for a particular folder/file. That resource will guide you one how to give you permissions to Application Pool Identity.
Alternatively you can give permissions from FileZilla itself. Simply right click the application root folder and select permissions. Then you can specify permissions from client side itself. But in most of the production cases, we have to add app pool user to the folder/file permissions list manually. But definitely give a try with FileZilla.