Erro ao conectar um BD Informix

Olá.Quando acesso um BD Informix dá o seguinte erro:"System.Data.OleDb.OleDbException: E42000: (-201) A syntax error has occurred. at System.Data.OleDb.OleDbCommand.ExecuteCommandTextErrorHandling(Int32 hr) at System.Data.OleDb.OleDbCommand.ExecuteCommandTextForSingleResult(tagDBPARAMS dbParams, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteCommandText(Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) at System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.OleDb.OleDbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.Common.DbDataAdapter.FillFromCommand(Object data, 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) at prjWSSefazMS.clsNotasFiscais.obter() in d:\webs\webservices\prjwssefazms\clsnotasfiscais.cs:line 71 at prjWSSefazMS.WSSefazMS.obterNF(Int64 NF, String IE) in d:\webs\webservices\prjwssefazms\wssefazms.asmx.cs:line 52"Alguém já passou por isso?A conexão tá Ok!Grato,