SqlDataAdapter.Fill problems

[Seiche V via DotNetMonster.com]

hy.

i want to fill a data table from a dataset using SqlDataAdapter.fill(myTable),
but i get the error: System.NullReferenceException: Object reference not set
to an instance of an object.

more of the error i get:
at System.Data.DataTable.RecordStateChanged(Int32 record1, DataViewRowState
oldState1, DataViewRowState newState1, Int32 record2, DataViewRowState
oldState2, DataViewRowState newState2)
at System.Data.DataTable.SetNewRecord(DataRow row, Int32 proposedRecord,
DataRowAction action, Boolean isInMerge)
at System.Data.DataTable.LoadDataRow(Object[] values, Boolean
fAcceptChanges)
at System.Data.Common.SchemaMapping.LoadDataRow(Boole an clearDataValues,
Boolean acceptChanges)
at System.Data.Common.DbDataAdapter.FillLoadDataRow(S chemaMapping mapping)
at System.Data.Common.DbDataAdapter.FillFromReader(Ob ject data, String
srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords,
DataColumn parentChapterColumn, Object parentChapterValue)
at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable, IDataReader
dataReader)
at System.Data.Common.DbDataAdapter.FillFromCommand(O bject data, Int32
startRecord, Int32 maxRecords, String srcTable, IDbCommand command,
CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable, IDbCommand
command, CommandBehavior behavior)
at System.Data.Common.DbDataAdapter.Fill(DataTable dataTable)

the table and the dataset are instantiated, there's no problem about that,
but the program crashes with this error only from time to time. i'm using sql
server 2000.

can somebody help me?

thank you.