SQL ERROR

System.Data.SqlClient.SqlException (0x80131904): 'from_unixtime' is not a recognized built-in function name.
'from_unixtime' is not a recognized built-in function name.
   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:a3b19a34-71b4-4817-970e-eb0b9e96a7f6
Error Number:195,State:10,Class:15
SELECT EVENT_NAME,EVENT_DATE,ClubID FROM events WHERE ClubID<>0 and (SUSPEND=0 or SUSPEND is null) and (isDeleted=0 or isDeleted is null) AND TEACHER_ID = 393 and EVENT_ID is not null and EVENT_ID<>0 and EVENT_NAME is not null and EVENT_NAME<>'' AND ( from_unixtime( event_date, '%Y-%m-%d') >= CURDATE() OR from_unixtime( event_end_date, '%Y-%m-%d') >= CURDATE() ) and EventMode<>2 Group By ClubID UNION SELECT EVENT_NAME,EVENT_DATE,ClubID FROM events e inner join ClassTeachers ct on ClubID=CLASS_ID WHERE ClubID<>0 and (SUSPEND=0 or SUSPEND is null) and (isDeleted=0 or isDeleted is null) AND ct.TEACHER_ID = 393 and e.EVENT_ID is not null and e.EVENT_ID<>0 and e.EVENT_NAME is not null and e.EVENT_NAME<>'' AND ( from_unixtime( event_date, '%Y-%m-%d') >= CURDATE() OR from_unixtime( event_end_date, '%Y-%m-%d') >= CURDATE() ) and (HIDDENFROMCLASS!=1 or HIDDENFROMCLASS is null) and EventMode<>2 Group By ClubID order by EVENT_DATE asc limit 0,5