Visual Basic Kullanırken bu hatayı alıyorum

Public Class Form1

    Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick

        Dim tarama As String = TextBox1.Text

        WriteDMAInteger("ac_client.exe", &H19DBBC, {&H1EC}, tarama, 1)

    End Sub



    Private Sub Button1_Click(sender As Object, e As EventArgs)

        Timer1.Enabled = True

    End Sub



    Private Sub Button2_Click(sender As Object, e As EventArgs)

        Timer2.Enabled = True

    End Sub



    Private Sub Timer2_Tick(sender As Object, e As EventArgs) Handles Timer2.Tick

        Dim mermi As String = TextBox2.Text

        WriteDMAInteger("ac_client.exe", &H85EB8, {&H8, &H7E8, &H9C, &H98, &HCE0}, mermi, 5)

    End Sub



    Private Sub Timer3_Tick(sender As Object, e As EventArgs) Handles Timer3.Tick

        Dim can As String = TextBox3.Text

        WriteDMAInteger("ac_client.exe", &H485EB8, {&H44, &H40, &H20, &H44, &HC, &H408}, can, 6)

    End Sub



    Private Sub Button3_Click(sender As Object, e As EventArgs)

        Timer3.Enabled = True

    End Sub

End Class