hi, please help i installed version 05.01.04 (3), no problem in installation or anywhere. Now i  want to upload a custom skin but the problem is . i cant see upload button on skin module. please help and when ever i try to change any setting like language it shows this error

DotNetNuke.Services.Exceptions.ModuleLoadException: Cannot insert duplicate key row in object 'dbo.Languages' with unique index 'IX_Languages'. The statement has been terminated. ---> System.Data.SqlClient.SqlException: Cannot insert duplicate key row in object 'dbo.Languages' with unique index 'IX_Languages'. 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.AddLanguage(String cultureCode, String cultureName, String fallbackCulture, Int32 CreatedByUserID) at DotNetNuke.Services.Localization.Localization.SaveLanguage(Locale locale) at DotNetNuke.Modules.Admin.Languages.EditLanguage.cmdUpdate_Click(Object sender, EventArgs e) --- End of inner exception stack trace ---

Thnx Sebastine for instent reply ,appreciat tht. but prob stil remains , i clicked on Extension Tab & select Skin from there it still not showing any upload or anything from where i can upload it. wht it showing is some 2 arrow , + signs at the very bottom of the page bt no Captions or anything on them to describe wht those buttons do.. i clicked on + sign , thought thts a button to upload but it opens another window & still no TExt or anything to describe the buttons can u tell me how can i upoad a skin using Extension Tab...

--This is the error when i click Edit button Near Skin Tab in the Table. shown below those 2 dropdowns on Extenstion Page.....

A critical error has occurred.
Value cannot be null. Parameter name: format

Thnx for help