SQL ERROR

System.Data.SqlClient.SqlException (0x80131904): The isnull function requires 2 argument(s).
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString, Boolean isInternal, Boolean forDescribeParameterEncryption, Boolean shouldCacheForAlwaysEncrypted)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, Boolean inRetry, SqlDataReader ds, Boolean describeParameterEncryptionRequest)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)
   at ClassCommonFuncV2.CommonFunctionsV2.dbconnect(Object sql, Object sqlname) in h:\root\home\a2zevents-001\www\site1\App_Code\CommonFunctionsV2.vb:line 121
ClientConnectionId:8730e0d4-01d2-4ce1-84b5-8595b2027e1a
Error Number:174,State:1,Class:15
SELECT top 10 NEWS_ID,PATH,NEWS_TITLE FROM news WHERE NEWS_TYPE = 'news' and ((TEACHER_ID in (select TeacherID from Affiliate_Professionals where Linkallactivities=1 and AffiliateSiteID =1)) or (VENUE_ID in (select VenueID from Affiliate_Venues where Linkallactivities=1 and AffiliateSiteID =1)) or (NEWS_ID in (select NewsID from Affiliate_News where NewsID!=0 and AffiliateSiteID =1)) or (WLURL='londonsalsa.co.uk')) and PATH is not null and PublishDate <=DATEDIFF(s, '1970-01-01 00:00:00', getdate()) AND (Archive =0 OR IsNull( Archive )) and ISApproved=1 ORDER BY date_added DESC