Modules & VBA :: Error 3259 When Adding A Record With Attachment?

I want to add a record with attachment to a table in an access (2013) database.

If I ignore the attachment error everything works as it should, but as soon as I add the code for the attachment I receive error code 3259.

Code:

Private Sub add_tune()
Dim dbtune As DAO.Database
Dim rst_tune As DAO.Recordset
Dim rst_tune_in As DAO.Recordset
Dim rs_child As DAO.Recordset
Set dbtune = CurrentDb

[code]....

Since I have a dutch office version the error text (ongeldig veld gegevenstype) is in dutch, translated it means something like a data type mismatch.

t_first_bars is a field in the table tbl_tune . The field type is attachment.