SYMTOMS
...
While clicking on Report menu a message appeared in the Repository tab or in Home tab or in Server tab as follows.
...
In Web Browser open ReportUI page manually using the URL : http://<localhost or Hostname of report Server>/GinesysReportUI/Admin.aspx
In Web Browser open ReportAPI page manually using URL : http://<localhost or Hostname of report server>/GinesysReportAPI/Api.asmx
Those pages will help us to find out Wrong DLL files. Then go to the following path & remove files from respective bin folder location as per the above understanding.
...