Hi:
Getting this error when installing the Tell a Friend LP.
Tried on both my home page and on a new page. Get this error.

Package: My Website 4.5.5

Package Item Status
1. Tab Send To a Friend.tab Failed
# Failure: System.Data.SqlClient.SqlException: Violation of UNIQUE KEY constraint 'IX_LynxMediaDemo_TabPermission'. Cannot insert duplicate key in object 'dbo.LynxMediaDemo_TabPermission'. The statement has been terminated. at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlDataReader.ConsumeMetaData() at System.Data.SqlClient.SqlDataReader.get_MetaData() at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) at System.Data.SqlClient.SqlCommand.ExecuteScalar() at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteScalar(SqlConnection connection, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteScalar(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteScalar(String connectionString, String spName, Object[] parameterValues) at DotNetNuke.Data.SqlDataProvider.AddTabPermission(Int32 TabID, Int32 PermissionID, Int32 roleID, Boolean AllowAccess, Int32 UserID) at DotNetNuke.Security.Permissions.TabPermissionController.AddTabPermission(TabPermissionInfo objTabPermission) at DotNetNuke.Entities.Tabs.TabController.AddTab(TabInfo objTab, Boolean AddAllTabsModules) at DotNetNuke.Entities.Tabs.TabController.AddTab(TabInfo objTab) at Bi4ce.Modules.xList.Packaging.Delivery.Tab_Install(PackageItem Item)

Hello LenLatimer,
Can you try deleting the 'Send to a Friend' tab that was created and then clear your recycle bin? After you do that you should be able reinstall correctly.