I just setup a new Sitecore environment from a backup. When I navigate to the admin portal -> select and item -> select publish Item, I get a blank page. In the console I see the following error (404)
https://local.url/sitecore/shell/client/Applications/Publishing/PublishingDialog.js
I checked the C:\sitecore\myWeb\Website\sitecore\shell\Applications folder and there is no Publishing folder. I checked on another colleague of mine and he also does not have this folder but for him the publish dialog works just fine. I also downloaded the SiteCore files and copied them over but still the same error.
I have 3 databases the core, master, and web. Somehow I'm wondering if it could be something to do with that?
In the backup you have, the Sitecore Publishing Service Module is Installed. This module contain the missing files, and also add, modify items in your core database.
See https://dev.sitecore.net/Downloads/Sitecore_Publishing_Service.aspx For the Download of the package
To Revert to default publishing after installing the Publishing Service see https://kb.sitecore.net/articles/154093
To disable the Publishing Service:
Locate the Sitecore.Publishing.Service.*.config files and change the file extension to .disabled. The files can be found in the following folders:
Switch to the Core database and rename the /sitecore/system/Aliases/Applications/Publish item to PublishDisabled.
Note: To enable the Publishing Service again, you must revert the changes that you made.
About The Publishing Service module
The Publishing Service module is an optional replacement for the Sitecore publishing functionality. A faster, reliable and user-friendly solution. It reduces the amount of time spent publishing large volumes of items and provides better visual feedback to the user. The Installation contain a Sitecore Package and a separated download for the Publishing Service .NET Core host, a new IIS Site.