I did some changes index.html in sharepoint designer. Although I got the changes back, it happened.

Server Error in '/' Application. Parser Error Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Duplicate ContentPlaceHolder 'PlaceHolderPageTitle' were found. ContentPlaceHolders require unique IDs.

Source Error:

Line 80: Line 81: Line 82: Line 83: Line 84:

Source File: /_catalogs/masterpage/UMA/index.master Line: 82

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3163.0


This happens when you give same id's (PlaceHolderPageTitle) to different ContentPlaceholder.

ContentPlaceHolder should have unique Id's.

Make sure you are giving unique Id value to each Content placeholder in master page


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