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Type mismatch error

Sorry to bother with a silly question, but this is driving me nuts. I have a sub that print a letter using word mailmerge. The source data used to be in an Excel sheet, and everything was fine, For a number oif reasons, I exported all data (including the excel file) into SQL Express and changed the code accordingly. Unfortunately, after a number of corrections to fix sayntx errors, I am stuck with this runtime data type mismatch I cannot get rid of. Is there a way to understand what causes the error? The error is in the opendatasource statemewnt

Sub PrintLetter2(Numerotessera As Double)
'Mail merge e stampa su stampante di default

'On Error GoTo ErrorHandler

' open template in Word
Dim filepath As String
Dim WordApp As Word.Application
Dim WordDoc As Word.Document
Dim strConnection As String, myquery As String
Dim bPrintBackgroud As Boolean
Dim oMerged As Document

Set WordApp = New Word.Application
filepath = CurrentProject.path
Debug.Print filepath, Numerotessera
With WordApp
    .Visible = True
    Set WordDoc = .Documents.Open(filepath & "\LetteraNuoviSoci.docx")
End With
'MailMerge selected records from table to Word document

myquery = "SELECT * FROM [LibroSoci] WHERE [Numero tessera] = " & Numerotessera
With WordApp
    .ActiveDocument.MailMerge.MainDocumentType = wdFormLetters
    .ActiveDocument.MailMerge.OpenDataSource _
        Name:="C:\Testhyp4\RicevuteConPrimaNotaFE.accdb", _
        ConfirmConversions:=False, ReadOnly:=False, LinkToSource:=True, _
        AddToRecentFiles:=False, PasswordDocument:="", PasswordTemplate:="", _
        WritePasswordDocument:="", WritePasswordTemplate:="", Revert:=False, _
        Format:=wdOpenFormatAuto, Connection:=RicevuteCPNCompleto, _
        SQLStatement:=myquery, SQLStatement1:="", _

        bPrintBackgroud = Options.PrintBackground
        Options.PrintBackground = False
        .Application.DisplayAlerts = wdAlertsNone
   With .ActiveDocument.MailMerge
        .Destination = wdSendToNewDocument
        .SuppressBlankLines = True
        'filepath & "\" & CurrentProject.Name, _

        With .DataSource
            .FirstRecord = wdDefaultFirstRecord
            .LastRecord = wdDefaultLastRecord
        End With
        .Execute Pause:=False
    End With
           Set oMerged = .ActiveDocument
            'Show the Print dialog box
            .Visible = True
            oMerged.Close 0
            'Restore all the alerts
            .Application.DisplayAlerts = wdAlertsAll
            Options.PrintBackground = bPrintBackgroud
End With

WordDoc.Close SaveChanges:=False

Exit Sub
If Err = 429 Then
'word is not running; open word with CreateObject
Set appWord = CreateObject(Class:="Word.Application")
End If

End Sub

Problem solved. The parameter
should habe been written
Thanks for your attention

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