Kentico 12 Portal Engine - System error: An error occurred and your request couldn't be completed - kentico

When trying to open any page in the Pages application in the CMS, we got an error:
System error: An error occurred and your request couldn't be completed.
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There are no error logs in the Kentico event log application regarding this error.
In the windows Event viewer, the only thing related to this problem was a warning. The screen shot is attached.
After deploying the project files from one environment to another the error appeared. To be more precise, after replacing the old CMS folder with the new one.
We are using Kentico 12 Portal Engine
System Error
Event Viewer details

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The image below shows a screenshot when the error occurs in SharePoint:
The image below shows a screenshot from the 'Central Administration Settings' in SharePoint for the 'Reporting Services Integration'. When I go to the url for "Report Server Web Service URL" the web browser only shows a directory list. Is that right?
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The HRESULT you're getting is from a COM error: System.Runtime.InteropServices.COMException (0x81020012): The specified name is already in use.
Make sure that the gallery you're trying to create is at the web level, not the site or webapplication level. Can you post examples of the URL when it worked vs. when it didn't?
Isn't the master page gallery usually at the site rather than web level? Subsites can use a master page defined by the parent site, so you could be confusing things by trying to define the master pages on the subsite as well.

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