Échec des commandes :

/*************************************************************/
/*************************************************************/

--
--Create Membership roles
--

IF ( NOT EXISTS ( SELECT name
                  FROM sysusers
                  WHERE issqlrole = 1
                  AND name = N'aspnet_Membership_FullAccess'  ) )
EXEC sp_addrole N'aspnet_Membership_FullAccess'

IF ( NOT EXISTS ( SELECT name
                  FROM sysusers
                  WHERE issqlrole = 1
                  AND name = N'aspnet_Membership_BasicAccess'  ) )
EXEC sp_addrole N'aspnet_Membership_BasicAccess'

IF ( NOT EXISTS ( SELECT name
                  FROM sysusers
                  WHERE issqlrole = 1
                  AND name = N'aspnet_Membership_ReportingAccess'  ) )
EXEC sp_addrole N'aspnet_Membership_ReportingAccess'


Exception SQL :
System.Data.SqlClient.SqlException (0x80131904): User does not have permission to perform this action.
User does not have permission to perform this action.
User does not have permission to perform this action.
   à System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   à System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   à System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   à System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)
   à System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
   à System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   à System.Web.Management.SqlServices.ExecuteFile(String file, String server, String database, String dbFileName, SqlConnection connection, Boolean sessionState, Boolean isInstall, SessionStateType sessionStatetype)
ClientConnectionId :841220f5-d556-4212-9c47-3dda884b7c27
Error Number :15247,State :1,Class :16