VB.Net เพิ่ม Insert ข้อมูล แล้ว Error ครับช่วยดูให้หน่อยนะครับ

Imports System.Data.OleDb

Public Class กิจกรรม
    Dim cnn As New OleDb.OleDbConnection

    Private Sub กิจกรรม_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim Table_ As String = "rubbersmall"
        Dim query As String = "SELECT * FROM " & Table_
        Dim MDBConnString_ As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=datason.accdb;"
        Dim ds As New DataSet


    End Sub


    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Me.Close()

    End Sub

    Private Sub reset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles reset.Click
        Me.txtdetial.Text = ""
        Me.txtday.Text = ""
        Me.txtcorver.Text = ""
        Me.txttree.Text = ""
        Me.txtlobor.Text = ""
        Me.txtunit.Text = ""
        Me.txtjob.Text = ""
        Me.txtdays.Text = ""
        Me.Id.Text = ""
        Me.Id.Focus()

    End Sub

    Private Sub RefreshData()
        If Not cnn.State = ConnectionState.Open Then
            cnn.Open()

        End If
        Dim da As New OleDb.OleDbDataAdapter("SELECT Id as [Id], " & _
                                            "details as [details],convert,tree,area,unit,lobor,day,days " & _
                                            "FROM datason ORDER BY ID", cnn)
        Dim dt As New DataTable
        da.Fill(dt)
        Me.dgvdata.datasouce = dt
        cnn.Close()
    End Sub
    Private Sub save_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles save.Click

        Dim cmd As New OleDb.OleDbCommand
        If Not cnn.State = ConnectionState.Open Then
            cnn.Open()
        End If
        cmd.Connection = cnn
        cmd.CommandText = "INSERT INTO rubbersmall (ID,details,convert,number tree,unit,labor,number day) " & _
                        "VULUES (" & Me.Id.Text & ",'" & _
                        Me.txtdetial.Text & ",'" & Me.txtcorver.Text & ",'" & Me.txttree.Text & ",'" & Me.txtunit.Text & ",'" & Me.txtlobor.Text & ",'" & Me.txtday.Text & ",'" & Me.txtdays.Text & "')"
        cmd.ExecuteNonQuery()
        RefreshData()
        cnn.Close()
    End Sub

    Private Function dgvdata() As Object
        Throw New NotImplementedException
    End Function

End Class