Error Message
Throwing Microsoft.ReportingServices.Diagnostics.Utilities. InternalCatalogException: Internal error, Microsoft.ReportingServices.Diagnostics.Utilities. InternalCatalogException: An internal error occurred on the report server. See the error log for more details. ---> System.UriFormatException: Invalid URI: The Uri string is too long
Solution
Sometimes, after upgrading the MS SQL server from 2008 to 2012/2014, you may receive such issues in reporting service. It is because, in SQL Server 2008 R2, the StringBuilder type does not perform any checks on the size limit but SQL Server 2012 throws an exception when the site is greater than 65520 characters. This can be fixed by installing hotfix from here https://support.microsoft.com/en-us/kb/2917531
